Posts tagged 'octahedron'
G.593 octahedron
An:term:**octahedron** <octahedron> is a:term:solid figure <G.529> contained by eight equal and:term:equilateral triangles <G.13>.
G.594 construct an octahedron and comprehend it in a
Construct an octahedron and comprehend it in a sphere, as in the preceding case; and to prove that the square on the diameter of the sphere is double of the square on the side of the octahedron.
G.601 set out sides
To set out the sides of the five figures and to compare them with one another.