Question 70 iUsing Eulers formula Find the value of unk

Question 70 iUsing Eulers formula Find the value of unk
| Question 70 (i)

Using Euler's formula. Find the value of unknown.      

Faces      7
vertices    10
Edges       x

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Right Answer is:

SOLUTION

By using Euler's formula for polyhedron
From, F= 7, V = 10 and E = x
So, F + V - E = 2
⇒ 7 + 10 - x = 2
⇒  17 - x = 2
⇒    17 - 2 = x
⇒          x = 15

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