Question

Question 70 (vi)

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

Faces 8
vertices 11
Edges r

Answer 1

By using Euler's formula for polyhedron
From, F = 8, V = 11 and E = r
So, F + V - E = 2
$\Rightarrow$ 8 + 11 - r = 2
$\Rightarrow$ 19 - r = 2
$\Rightarrow$ r = 19 - 2
$\Rightarrow$ r = 17