for the academic journal Tetrahedron journal Reg polyhedra db Reg polyhedron stat table T In geometry , a tetrahedron plural tetrahedra is a polyhedron composed of four triangle triangular faces, three of which meet at each vertex geometry vertex . A regular tetrahedron is one in which the four triangles are regular, or equilateral , and is one of the Platonic solid s. The tetrahedron is the only convex polytope convex polyhedron that has four faces. ref name MW MathWorld urlname Tetrahedron title Tetrahedron ref The tetrahedron is the three dimensional case of the more general concept of a Euclidean geometry Euclidean simplex . The tetrahedron is one kind of pyramid geometry pyramid , which .... In the case of a tetrahedron the base is a triangle any of the four faces can be considered the base , so a tetrahedron is also known as a triangular pyramid . Like all convex polyhedron convex polyhedra, a tetrahedron can be folded from a single sheet of paper. It has two nets. ref name MW For any tetrahedron there exists a sphere the circumsphere such that the tetrahedron s vertices lie on the sphere s surface. Formulas for regular tetrahedron Tetrahedral angle redirects here For a regular tetrahedron ... and the vertices, ref http maze5.net ?page id 367 Angle Between 2 Legs of a Tetrahedron Maze5.net ref ... divides each median in the ratio 2 1 proof . Volume The volume of a tetrahedron is given by the pyramid .... For a tetrahedron with vertices a a sub 1 sub , a sub 2 sub , a sub 3 sub , b b sub 1 sub , b ... of a parallelepiped , we conclude that the volume of a tetrahedron is equal to 1 6 of the volume ... . Given the distances between the vertices of a tetrahedron the volume can be computed using the Cayley ... means that a tetrahedron cannot be constructed with the given distances. This formula, sometimes ... of a tetrahedron lie on two skew lines . If the closest pair of points between these two lines are points ... V frac d mathbf a times mathbf b c 6 . math Properties of a generalized tetrahedron The tetrahedron ... more details
Infobox Journal title Tetrahedron cover Image Tetrahedron cover.gif 150 px discipline Organic chemistry abbreviation Tetrahedron website http www.elsevier.com wps find journaldescription.cws home 942 description?navopenmenu 1 publisher Elsevier country United Kingdom history 1957 to present ISSN 0040 4020 Tetrahedron is a scientific journal publishing full original research papers in the field of organic chemistry . The impact factor of this journal is 2.817 2007 . ref Journal Citation Reports, 2007 ref It has published a number of highly cited papers, seven of which having 1000 citation each according to Web of Science , 2008 References references See also Tetrahedron Asymmetry Tetrahedron Letters External links http www.sciencedirect.com science journal 00404020 Tetrahedron online via ScienceDirect http www.elsevier.com wps find journaldescription.cws home 942 description?navopenmenu 1 Tetrahedron homepage Reed Elsevier chem journal stub Category Chemistry journals Category Elsevier academic journals de Tetrahedron fr Tetrahedron journal pl Tetrahedron sk Tetrahedron asopis zh ... more details
A Heronian tetrahedron is a tetrahedron whose side lengths, face areas and volume are all rational number s. The faces must therefore all be Heronian triangle s. A regular tetrahedron with rational sides is not a Heronian tetrahedron because its face areas and volume are not rational numbers. A Heronian tetrahedron is sometimes called a perfect tetrahedron . 117 is the smallest possible length of the longest side of a perfect tetrahedron. Its other sidelengths are 51, 52, 53, 80 and 84. See also Euler brick External links mathworld HeronianTetrahedron http web.archive.org web 20091027105752 http geocities.com teufel pi papers perfectpyramids.pdf Perfect Pyramids Polyhedron stub Category Polyhedra Category Arithmetic problems of solid geometry fr T tra dre de H ron ... more details
Infobox journal title Tetrahedron Letters cover Image Tetrahedron Letters cover.gif 150 px editor discipline Organic chemistry peer reviewed language English language English formernames abbreviation Tetrahedron Lett. publisher Elsevier country United Kingdom frequency 52 year history 1959 present openaccess license impact 2.538 impact year 2008 website http www.elsevier.com wps find journaldescription.cws home 233 description description link1 http www.sciencedirect.com science journal 00404039 link1 name Archive link2 link2 name RSS atom JSTOR OCLC LCCN CODEN ISSN 0040 4039 eISSN boxwidth Tetrahedron Letters is a weekly international journal for rapid publication of full original research papers in the field of organic chemistry . Its 2008 impact factor was 2.538. Indexing Tetrahedron Letters is indexed in columns list 2 AGRICOLA BIOSIS Beilstein database CAB Abstracts Chemical Abstracts Chemical Engineering Biotechnology Abstracts Current Biotechnology Abstracts Current Contents Search Current Contents Life Sciences Current Contents Physics, Chemical, & Earth Sciences Derwent Drug File El Compendex Plus Excerpta Medica MEDLINE PASCAL database Pascal Research Alert Science Citation Index Scisearch Scopus See also Tetrahedron journal TetrahedronTetrahedron Asymmetry Reed Elsevier Category Chemistry journals Category Journal established in 1959 chem journal stub de Tetrahedron Letters es Tetrahedron Letters fr Tetrahedron Letters pl Tetrahedron Letters zh ... more details
Semireg dual polyhedra db Semireg dual polyhedron stat table dtT In geometry , a triakis tetrahedron is an Archimedean solid Archimedean dual solid, or a Catalan solid . Its dual is the truncated tetrahedron . It can be seen as a tetrahedron with Tetrahedron triangular pyramids added to each face that is, it is the Kleetope of the tetrahedron. This interpretation is expressed in the name. If the triakis tetrahedron has shorter edge lengths 1, it has area math frac 5 3 sqrt 11 math and volume math frac 25 36 sqrt 2 math . If the polyhedron has equilateral triangle faces, it becomes the net of the four dimensional regular polytope known as the pentachoron . File Stellation of triakis tetrahedron.png thumb 100px left A stellation of the triakis tetrahedron. It has thirteen stellations, including the one pictured at left. See also Truncated triakis tetrahedron References The Geometrical Foundation of Natural Structure book Section 3 9 Citation last1 Wenninger first1 Magnus author1 link Magnus Wenninger title Dual Models publisher Cambridge University Press isbn 978 0 521 54325 5 id MathSciNet id 730208 year 1983 The thirteen semiregular convex polyhedra and their duals, Page 14, Triakistetrahedron The Symmetries of Things 2008, John H. Conway, Heidi Burgiel, Chaim Goodman Strass, ISBN 978 1 56881 220 5 http www.akpeters.com product.asp?ProdCode 2205 Chapter 21, Naming the Archimedean and Catalan polyhedra and tilings, page 284, Triakis tetrahedron External links Mathworld2 urlname TriakisTetrahedron title Triakis tetrahedron urlname2 CatalanSolid title2 Catalan solid Polyhedron navigator Polyhedron stub Category Catalan solids ca Tetr edre triakis de Triakistetraeder es Triaquistetraedro eo Trilateropiramidigita kvaredro fr Triakit tra dre it Triacistetraedro ja pt Tetraedro triakis ... more details
Image ReuleauxTetrahedron Animation.gif frame right Animation of a Reuleaux tetrahedron, showing also the tetrahedron from which it is formed. Image Reuleaux tetrahedron intersection.png thumb Four spheres intersect to form a Reuleaux tetrahedron. The Reuleaux tetrahedron is the intersection of four spheres of radius s centered at the Vertex geometry vertices of a regular tetrahedron with side length s . The sphere through each vertex passes through the other three vertices, which also form vertices of the Reuleaux tetrahedron. The Reuleaux tetrahedron has the same face structure as a regular tetrahedron, but with curved faces four vertices, and four curved faces, connected by six circular arc edges. This shape is defined and named by analogy to the Reuleaux triangle , a two dimensional curve of constant width . One can find repeated claims in the mathematical literature that the Reuleaux tetrahedron is analogously a surface of constant width , but it is not true the two midpoints of opposite edge arcs are separated by a larger distance, math sqrt3 sqrt2 2 s approx 1.0249s. math The volume of a Reuleaux tetrahedron is ref name Weisstein citation author Weisstein, Eric W authorlink Eric W. Weisstein title Reuleaux Tetrahedron publisher MathWorld A Wolfram Web Resource year 2008 url http mathworld.wolfram.com ReuleauxTetrahedron.html ref math frac s 3 12 3 sqrt2 49 pi 162 tan 1 sqrt2 approx 0.422s 3 math Meissner bodies linked from Meissner body , etc. Meissner and Schilling ref name Meissner citation last1 Meissner first1 Ernst last2 Schilling first2 Friedrich title Drei Gipsmodelle von Fl chen konstanter Breite journal Z. Math. Phys. volume 60 year 1912 pages 92 94 ref showed how to modify the Reuleaux tetrahedron to form a surface of constant width , by replacing three of its edge arcs by curved patches formed as the surfaces of rotation of a circular arc. According to which three edge arcs are replaced three that have a common vertex or three that form a triangle there result ... more details
The Logos Tetrahedron is a concert hall in Ghent, Belgium adjacent to the Logos Foundation recording studio and offices. It has seating for 150 people and is equipped with sound and light infrastructure. Since the concert hall is in the shape of a tetrahedron , it has no straight angles and, as a result, no standing waves can occur. Acoustic waves can never amplify one another in phase and are reflected by the walls under ever changing angles. The hall is exclusively used for contemporary and experimental music, such as electronic music and computer music and holds approximately 65 concerts a year, mostly organized by the Logos Foundation. The concert hall was built in 1990 by Godfried Willem Raes and the Logos workgroup using steel, concrete and plate metal. Construction took one year. The hall was opened in 1991 with a three day festival. External links http www.logosfoundation.org architecture tetrhall.html Logos Tetrahedron Concert Hall http www.logosfoundation.org tetrhall techspec.html Technical notes and infrastructure survey for musicians Category Ghent Category Buildings and structures completed in 1991 Category Event venues established in 1991 Category 1990 architecture culture stub ... more details
In geometry , the Reeve tetrahedron is a polyhedron , named after J. E. Reeve, in R sup 3 sup with vertices at 0, 0, 0 , 1, 0, 0 , 0, 1, 0 and 1, 1, r where r is a positive integer. Each vertex lies on a fundamental lattice point a point in Z sup 3 sup . No other fundamental lattice points lie on the surface or in the interior of the tetrahedron . In 1957 Reeve used this tetrahedron as a counterexample to show that there is no simple equivalent of Pick s theorem in R sup 3 sup or higher dimensional spaces ref J. E. Reeve, On the Volume of Lattice Polyhedra , Proceedings of the London Mathematical Society , s3&ndash 7 1 378&ndash 395 ref . This is seen by noticing that Reeve tetrahedra have the same number of interior and boundary points for any value of r , but different volumes. Notes and references reflist Ko odziejczyk, Krzysztof 1996 . An Odd Formula for the Volume of Three Dimensional Lattice Polyhedra , Geometriae Dedicata 61 271&ndash 278. Category Digital geometry Category Lattice points ... more details
Semireg polyhedra db Semireg polyhedron stat table tT In geometry , the truncated tetrahedron is an Archimedean solid . It has 4 regular hexagon al faces, 4 regular triangle geometry triangular faces, 12 vertices and 18 edges. Area and volume The area A and the volume V of a truncated tetrahedron of edge length a are math A 7 sqrt 3 a 2 approx 12.12435565a 2 math math V frac 23 12 sqrt 2 a 3 approx 2.710575995a 3. math Cartesian coordinates Cartesian coordinates for the 12 vertices of a Truncation geometry truncated tetrahedron centered at the origin, with edge length 8, are all permutations of 1, 1, 3 with an even number of minus signs 3, 1, 1 , 1, 3, 1 , 1, 1, 3 &minus 3,&minus 1, 1 , &minus 1,&minus 3, 1 , &minus 1,&minus 1, 3 &minus 3, 1,&minus 1 , &minus 1, 3,&minus 1 , &minus 1, 1,&minus 3 3,&minus 1,&minus 1 , 1,&minus 3,&minus 1 , 1,&minus 1,&minus 3 class wikitable width 480 valign top Image UC54 2 truncated tetrahedra.png 160px BR The set of vertex permutations 1, 1, 3 with an odd number of minus signs forms a complementary truncated tetrahedron, and combined they form a Compound polyhedron Uniform compounds uniform compound polyhedron . File Truncated 3 simplex.png 160px BR Orthogonal projection Another simple construction exists in 4 space as cells of the truncated 16 cell , with vertices as coordinate permutation of 0,0,1,2 Related polyhedra Tetrahedron family Use in architecture Giant truncated tetrahedrons were used for the Man the Explorer and Man the Producer theme pavilions in Expo 67 . They were made of massive girders of steel bolted together in a geometric lattice. The truncated tetrahedrons were interconnected with lattice steel platforms. All of these buildings were demolished after the end of Expo 67, as they had not been built to withstand the severity of the Montreal weather over the years. Their only remnants are in the Montreal city archives ... mathworld2 urlname TruncatedTetrahedron title Truncated tetrahedron urlname2 ArchimedeanSolid title2 ... more details
In geometry , the Hill tetrahedra are a family of Space filling polyhedron space filling tetrahedron tetrahedra . They were discovered in 1896 by M.J.M. Hill, a professor of mathematics at the University College London , who showed that they are Hilbert s third problem scissor congruent to a cube . Construction For every math alpha in 0,2 pi 3 math , let math v 1,v 2,v 3 in Bbb R 3 math be three unit vectors with angle math alpha math between every two of them. Define the Hill tetrahedron math Q alpha math as follows math Q alpha , , c 1 v 1 c 2 v 2 c 3 v 3 mid 0 le c 1 le c 2 le c 3 le 1 . math A special case math Q Q pi 2 math is the tetrahedron having all sides right triangles with sides 1, math sqrt 2 math and math sqrt 3 math . Ludwig Schl fli studied math Q math as a special case of the Schl fli orthoscheme orthoscheme , and H.S.M. Coxeter called it the characteristic tetrahedron of the cubic spacefilling. Properties A cube can be tiled with 6 copies of math Q math . Every math Q alpha math can be Dissection geometry dissected into three polytopes which can be reassembled into a prism geometry prism . Generalizations In 1951 Hugo Hadwiger found the following n dimensional generalization of Hill tetrahedra math Q w , , c 1 v 1 cdots c n v n mid 0 le c 1 le cdots le c n le 1 , math where vectors math v 1, ldots,v n math satisfy math v i,v j w math for all math 1 le i j le n math , and where math 1 n 1 w 1 math . Hadwiger showed that all such simplex simplices are scissor congruent to a hypercube . References M. J. M. Hill, Determination of the volumes of certain species of tetrahedra without employment of the method of limits, Proc. London Math. Soc. , 27 1895 1896 , 39 53. Hugo Hadwiger H. Hadwiger , Hillsche Hypertetraeder, Gazeta Matem tica Lisboa , 12 No. 50, 1951 , 47 48. H.S.M. Coxeter , http matwbn.icm.edu.pl ksiazki aa aa18 aa18132.pdf Frieze patterns , Acta ... of a Hill tetrahedron into a triangular prism Category Polyhedra Category Space filling polyhedra ... more details
In geometry , tetrahedron packing is the problem of arranging identical regular tetrahedron tetrahedra throughout three dimensional space so as to fill the maximum possible fraction of space. File 120px Tetrahedron slowturn.gif thumb right A regular tetrahedron. Currently, the best lower bound achieved on the optimal packing fraction of regular tetrahedra is 85.63 . ref name chen2010 Cite arxiv first1 Elizabeth R. last1 Chen first2 Michael last2 Engel first3 Sharon C. last3 Glotzer title Dense crystalline dimer packings of regular tetrahedra date January 6, 2010 class arxiv 1001.0586 ref ref cite journal last1 Torquato first1 S. last2 Jiao first2 Y. title Exact constructions of a family of dense periodic packings of tetrahedra journal Physical Review E volume 81 issue 4 year 2010 doi 10.1103 PhysRevE.81.041310 ref It has been known for hundreds of years that the tetrahedron does not tessellation tile space, but an upper bound below 100 namely math 1 2.6 ldots times 10 25 math has only recently been reported. ref cite journal author1 Simon Gravel author2 Veit Elser author3 Yoav Kallus doi 10.1007 s00454 010 9304 x title Upper bound on the packing density of regular tetrahedra and octahedra year 2010 journal Discrete and computational geometry arxiv 1008.2830 ref Historical results In 2006, John Horton Conway Conway and Torquato showed that a packing fraction about 72 can be obtained by constructing a non Bravais lattice packing of tetrahedra with multiple particles with generally different orientations per repeating unit , and thus they showed that the best tetrahedron packing ..., Chaikin and coworkers experimentally showed that tetrahedron like dice can randomly pack in a finite ... doi 10.1038 nature08239 ref Later these same authors obtained a denser random tetrahedron packing ... tetrahedron unit cell, they obtained a packing density as high as 85.03 . ref cite journal last1 ... Y. last2 Jiao year 2009 title Analytical Constructions of a Family of Dense Tetrahedron Packings ... more details
File Coxeter Dynkin 3 space groups.png 480px thumb For 3 space, there are 3 simple Goursat tetrahedra, represented by 4,3,4 , 4,3 sup 1,1 sup , and a square graph. In geometry , a Goursat tetrahedron is a tetrahedron tetrahedral fundamental domain of a Wythoff construction . Each tetrahedral face represents a reflection hyperplane on 3 dimensional surfaces the 3 sphere , the Euclidean 3 space, and hyperbolic 3 space. Coxeter named after Edouard Goursat who first looked into these domains. It is an extension of the theory of Schwarz triangle s for Wythoff constructions on the sphere. Graphical representation A Goursat tetrahedron is represented graphically by a tetrahedral graph. Each node represents a face mirror of the Goursat tetrahedron. Each edge is labeled by a rational value corresponding to the reflection order, being dihedral angle . File General Goursat tetrahedron.png 100px A 4 node Coxeter Dynkin diagram represents this tetrahedral graphs with order 2 edges hidden. If some edges are order 2, the Coxeter group can be used for a simpler notation. Solutions There are many hundreds of solutions with finite polytope density densities . 3 sphere solutions The solutions for the 3 sphere with density 1 solutions are Duoprism s p x q , CDD node p node 2 node q node Hyperprism s 3,3 x , CDD node 3 node 3 node 2 node 3,4 x , CDD node 3 node 4 node 2 node 3,5 x , CDD node 3 node 5 node 2 node Regular 4 polytope s 3,3,3 , CDD node 3 node 3 node 3 node 3,3,4 , CDD node 3 node 3 node 4 node 3,4,3 , CDD node 3 node 4 node 3 node 3,3,5 , CDD node 3 node 3 node 5 node 3 sup 1,1,1 sup , CDD nodes split2 node 3 node Some higher density solutions for the 3 sphere , generating the Schl fli Hess polychoron s are Density 4 3,5,5 2 CDD node 3 node 5 node 5 rat d2 node Density 6 5,5 2,5 CDD node 5 node 5 rat d2 node 5 node Density 20 5,3,5 2 CDD node 5 node 3 node 5 rat d2 node Density 66 5 2,5,5 2 CDD node 5 rat d2 node 5 node 5 rat d2 node Density 76 5,5 2,3 CDD node 5 node 5 ... more details
Tetrahedron Provincial Park is a provincial park in British Columbia , Canada , located northeast of Sechelt, British Columbia Sechelt in the Sunshine Coast, British Columbia Sunshine Coast area of the province. The park was created in 1995. ref http www.wildernesscommittee.org campaigns historic sunshine Wilderness Committee Sunshine Coast ref coord 49 36 N 123 35 W display title name Tetrahedron Provincial Park External links BCGNIS 41350 Tetrahedron Park http www.env.gov.bc.ca bcparks explore parkpgs tetra.html British Columbia Ministry of the Environment Tetrahedron Provincial Park References reflist Pacific Ranges Category Provincial Parks of British Columbia Category Sunshine Coast Regional District Category Protected areas established in 1995 BritishColumbia park stub ... more details
Summary Information Description en 1 en Petrie polygon tetrahedron Source Own work by uploader Author User Tomruen Tomruen Date 8 9 09 Permission yes other versions Commons Copyright tags Licensing self cc by sa 3.0 GFDL ImageUpload full Category Polytopes ... more details
border 1 bgcolor ffffff cellpadding 5 align right style margin left 10px width 250 bgcolor e7dcc3 colspan 2 Truncated triakis tetrahedron align center colspan 2 Image Truncated triakis tetrahedron.png 240px Truncated triakis tetrahedron bgcolor e7dcc3 Type Conway polyhedron notation Conway polyhedron bgcolor e7dcc3 Faces 4 hexagon s br 12 pentagon s bgcolor e7dcc3 Edges 42 bgcolor e7dcc3 Vertices 28 bgcolor e7dcc3 Vertex configuration 4 5.5.5 BR 24 5.5.6 bgcolor e7dcc3 List of spherical symmetry groups Symmetry group T sub d sub bgcolor e7dcc3 Properties Convex polytope convex The truncated triakis tetrahedron is a convex polyhedron with 16 faces 4 sets of 3 pentagon s arranged in a Tetrahedral symmetry tetrahedral arrangement, with 4 hexagon s in the gaps. It is constructed from taking a triakis tetrahedron by Truncation geometry truncating the order 6 vertices. This creates 4 regular hexagon faces, and leaves 12 irregular pentagons. A topologically similar equilateral polyhedron can be constructed by using 12 Regular polygon regular pentagons with 4 equilateral but nonplanar hexagons, each vertex with internal angle s alternating between 108 and 132 degrees. See also Near miss Johnson solid External links http www.orchidpalms.com polyhedra acrohedra nearmiss jsmn.htm Johnson Solid Near Misses Number 23 http www.georgehart.com virtual polyhedra conway notation.html George Hart s Polyhedron generator t6dtT Conway polyhedron notation Near miss Johnson solids navigator DEFAULTSORT Truncated Triakis Tetrahedron Category Polyhedra Polyhedron stub fr triakit tra dre tronqu eo Senpintigita trilateropiramidigita kvaredro ... more details
Infobox Polyhedron with net Image File augmented truncated tetrahedron.png Polyhedron Type Johnson solid Johnson br augmented tridiminished icosahedron J sub 64 sub J sub 65 sub augmented truncated cube J sub 66 sub Face List 2 2x3 triangle s br 3 Square geometry square s br 3 hexagon s Edge Count 27 Vertex Count 15 Symmetry Group Point groups in three dimensions C sub 3v sub Vertex List 2x3 3.6 sup 2 sup br 3 3.4.3.4 br 6 3.4.3.6 Dual Property List Convex set convex Net Image File Johnson solid 65 net.png In geometry , the augmented truncated tetrahedron is one of the Johnson solid s J sub 65 sub . It is created by attaching a triangular cupola to one hexagon al face of an truncated tetrahedron . External links MathWorld urlname JohnsonSolid title Johnson Solid MathWorld urlname AugmentedTruncatedTetrahedron title Augmented truncated tetrahedron Polyhedron stub Category Johnson solids es Tetraedro truncado aumentado eo Pligrandigita senpintigita kvaredro fr T tra dre tronqu augment nl Verhoogde afgeknotte tetra der th ... more details
Summary Non free use rationale Description Scientific journal cover Source Journal website see below Portion all Article Tetrahedron journal Low resolution It is a low resolution version of the journal cover. Purpose The image will be used for identification and critical commentary in the journal article and possibly other articles in which a visual identification of the journal will serve an educational purpose. Replaceability As the official journal cover, there is no known free alternative available. If a free alternative is found, this image should be Wikipedia Images and media for deletion nominated for deletion as obsolete. other information The use is purely for non profit reasons, and to educate users on the journal in question. Its use does not limit the copyright owner s rights to sell or market related products or the journal itself in any way. Licensing Non free magazine cover ... more details
Summary Non free use rationale Description Scientific journal cover Source Journal website see below Portion all Article Tetrahedron Letters Low resolution It is a low resolution version of the journal cover. Purpose The image will be used for identification and critical commentary in the journal article and possibly other articles in which a visual identification of the journal will serve an educational purpose. Replaceability As the official journal cover, there is no known free alternative available. If a free alternative is found, this image should be Wikipedia Images and media for deletion nominated for deletion as obsolete. other information The use is purely for non profit reasons, and to educate users on the journal in question. Its use does not limit the copyright owner s rights to sell or market related products or the journal itself in any way. Licensing Non free magazine cover ... more details
Summary This is a picture generated from a crystal structure data reported by Qi Gao and William L. Parker in Tetrahedron, 1998, Volume 52, Issue 7, pages 2291 2300. It shows 10 deacetyl 7 epitaxol molecule which is a closely related to paclitaxel Taxol . It was made by myself and is free to be used by all. Licensing GFDL self migration relicense ... more details
Information Description chart of tetrahedra with various symmetries Source I created this work entirely by myself. Date 2 5 09 Author User SockPuppetForTomruen SockPuppetForTomruen User talk SockPuppetForTomruen talk other versions PD self date February 2009 ... more details
Summary Information Description Pyraminx puzzle. A puzzle of the Rubik type except tetrahedral pyramid shaped instead of cubic. Source self made photograph Date 31st December 2007 Location From uploader s personal collection of puzzles Author User Spinningspark font style background FFF090 color 00C000 Sp font style background FFF0A0 color 80C000 in font style color C08000 ni font font font style color C00000 ng font font font style color 2820F0 Spark font real life identity SHA 1 commitment ba62ca25da3fee2f8f36c101994f571c151abee7 Permission Released by me under the Creative Commons Attribution ShareAlike 3.0 Licence other versions Licensing cc by sa 3.0 KeepLocal ... more details
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