Posts tagged 'icosahedron'

G.596 icosahedron

An:term:**icosahedron** <icosahedron> is a:term:solid figure <G.529> contained by twenty equal and:term:equilateral triangles <G.13>.

G.597 construct an icosahedron and comprehend it in a

Construct an icosahedron and comprehend it in a sphere, like the aforesaid figures; and to prove that the side of the icosahedron is the irrational segment called minor.

G.601 set out sides

To set out the sides of the five figures and to compare them with one another.