Question

If a polyhedron has 15 edges and 9 vertices how many face will it have?
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Answer 1

8

Explanation:

E = 15, V = 9, F =?

By Euler's rule, we have:

F + V - E = 2

F + 9 - 15 = 2

F - 6 = 2

F = 6 + 2

F = 8