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An icosahedron is a regular polyhedron that has 20
All the faces are
and are all
that is, all the same size. It is one of the five
If s is the length of any edge, then each face has an area given by:
Since there are 20 faces, when we multiply the above by 20 and simplify, we get the surface area of the whole object. As the formula:
If s is the length of any edge, then the volume enclosed by the icosahedron is given by the formula:
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