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Verify Euler’s formula for these solids.

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(i) Number of faces = F = 7 

Number of vertices = V = 10 

Number of edges = E = 15

We have, F + V − E = 7 + 10 − 15 = 17 − 15 = 2 

Hence, Euler’s formula is verified.

(ii) Number of faces = F = 9

Number of vertices = V = 9

Number of edges = E = 16

F + V − E = 9 + 9 − 16 = 18 − 16 = 2

Hence, Euler’s formula is verified.

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