icosahedron
二十面体,二十二面体,二十八面体,二十进制
Definitions
- 1
plural i·co·sa·he·drons, i·co·sa·he·dra [ahy-koh-suh-hee-druh, ahy-kos-uh-]. /aɪˌkoʊ səˈhi drə, aɪˌkɒs ə-/.
- : a solid figure having 20 faces.
Examples
That is, he thought where there’s water, you’d need to be able to arrange copies of the icosahedral water particle such that the icosahedra perfectly occupied the entirety of the watery space without overlapping.
Two of these generate the cube and the octahedron; five of these generate the dodecahedron and the icosahedron.
The Icosahedron, having twenty equilateral triangles as faces.
Within the earth's orbit inscribe an icosahedron: the sphere inscribed in it will be Venus's orbit.
Now, inscribe in the Earth an icosahedron, the circle inscribed in it will be Venus.
That for the tetrahedron has 12 for its order, for the cube (or octahedron) 24, and for the icosahedron (or dodecahedron) 60.