(a) Find the number of edges of a polyhedron having 20 faces and 12 vertices.
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According to the formula given by Euler.
F + V = E + 2
Where,
F = no. of faces
V = no. of vertices
E = no. of edges
So,
=> 20 + 12 = E + 2
=> 32 = E + 2
=> E = 32 - 2
=> E = 30
Therefore, there are 30 edges of a polyhedron having 20 faces and 12 vertices.
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