pentahedron
/ˌpɛntəˈhiːdr(ə)n
/noun (plural pentahedra /ˌpɛntəˈhiːdrə/ or pentahedrons)
A solid figure with five plane faces.Whereas the tetrahedron is composed of four triangles, the pyramid (or pentahedron), which looks a lot like it, is composed of four triangles and a square - the base....
- You can also have an Egyptian pentahedron square-base pyramid.
- Then the pyramids are cut by silhouettes into a set of pentahedrons, which together constitute the centripetal pentahedron model of the visual hull.
Derivatives
pentahedral
- There are two topologically distinct pentahedral graphs which, through duality, correspond to the skeletons of the square pyramid and triangular dipyramid.
- I noticed that it was closely related to the pentahedral prism packing.
Origin
Late 18th century: from penta- 'five' + -hedron, on the pattern of words such as polyhedron.