Pyramid sgwâr: Gwahaniaeth rhwng fersiynau

Cynnwys wedi'i ddileu Cynnwys wedi'i ychwanegu
#wici365
 
Llinell 70:
|-
|align=center|Gellir ystyried yr [[Octahedron]] rheolaidd yn sgwâr deubyramid, h.y. dau sgwâr Johnson, gyda'u gwaelodion wedi'u cysylltu wyneb-ar-wyneb.
|Gellir creu Thetetracis [[tetrakis hexahedronhecsahedron]] canallan beo constructed from a [[cube]]giwb, withgan shortroi squarepyramidiau pyramidssgwar, addedbychan toar eachbob faceochr.
|Square [[frustum]] is a square pyramid with the apex truncated.
|}<ref>http://woodenpolyhedra.web.fc2.com/JohnsonHoneycomb.pdf</ref>
|}
 
''Square pyramids'' fill space with [[tetrahedron|tetrahedra]], [[truncated cube]]s or [[cuboctahedron|cuboctahedra]].<ref>http://woodenpolyhedra.web.fc2.com/JohnsonHoneycomb.pdf</ref>
 
==Ceir hefyd==