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Faces, Edges and Vertices

A triangular ...

Question

A triangular prism has edges.

A

12

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B

6

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C

9

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Solution

The correct option is C 9
A triangular prism has 5 faces and 6 vertices. From Euler's Formula we can calculate the number of edges as :
$V - E + F = 2$
$\Rightarrow E = V + F - 2$
$\Rightarrow E = 6 + 5 + - 2$
$\Rightarrow E = 9$

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