decahedron
/ˌdɛkəˈhiːdr(ə)n
/noun (plural decahedra /ˌdɛkəˈhiːdrə/ or decahedrons)
A solid figure with ten plane faces.Now fold, crease, decorate, and glue your decahedron, following the same hints given on the tetrahedron page....
- The two models in the top row are compounds of two decahedra each. The model in the bottom row left and right is a nonconvex octahedron, consisting of 4 squares and 4 triangles.
- Like the elongated shapes, the pentagons and hexagons are also characterized by a fivefold symmetry; we thus observe regular decahedrons and icosahedrons.
Derivatives
decahedral
- In fact, they have a truncated decahedral structure with a 5-fold symmetry.
- Decahedral clusters have a surface tension closer to that of fcc and hcp ones than to that of icosahedral ones, though both icosahedral and decahedral structures have five fold symmetry axis.
- The vertical ionization potentials of Al { sub 3 } X is larger than that of Al { sub 13 } in the decahedral structure while the opposite is the case with the icosahedral isomer.
Origin
Early 19th century: from deca- 'ten' + -hedron, on the pattern of words such as polyhedron.