Question

Question 70 (iii)

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

Faces 9
vertices z
Edges 16

Answer 1

By using Euler's formula for polyhedron
From, F= 9, E = 16, and V = z
So, F + V - E = 2
$\Rightarrow$ 9 + z - 16 = 2
$\Rightarrow$ z - 7 = 2
$\Rightarrow$ z = 2 + 7
$\Rightarrow$ z = 9