Formula for even sided shapes:
Number of sides divided by 2.
20 divided by two equals 10.
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30
A Icosahedron has 20 faces and 30 edges.And for those of you who are wondering, it also has 12 vertices.30 edges
In any cube, you can sort the edges into three sets, with 4 edges in each set. All four edges in a set are parallel to each other, and none of the edges in one set is parallel to any of the edges in any other set.
An icosahedron is a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles. icos is Greek for 20
An icosahedron is any 20 sided figure.