1.

A polyhedron has 7 faces and 10 vertices. How many edges does the polyhedron have?

Answer»

For any polyhedron, 

F + V – E = 2 

Here, F = 7, V = 10, E = ? 

Using above formula, 

⇒7 + 10 – E = 2 

⇒17 – E = 2 

⇒17 – 2 = E 

⇒ Ε = 15



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