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Look up on line in the Free Dictionary by Farlex. Shows a picture of the 20-sided icosahedron in which it appears that the top and bottom have 5 sides each and the center has 10 sides.
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.