You would need to divide it into triangles, find the area of each triangle and sum these areas together.
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You need to find the area of each of its faces and add them together. An icosahedron may or may not have parallel faces. For example, an icosahedron, in the form of a pyramid with a 19-gon base will have no parallel faces.
no. of edges on a icosahedron are 30
vearice does has a icosahedron have is19
Truncated icosahedron Truncated icosahedron
There Isn't a shape bigger than the Icosahedron.