Question

Question 70 (ii)

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

Faces y
vertices 12
Edges 18

Answer 1

By using Euler's formula for polyhedron
From, V = 12, E = 18 and F = y
So, F + V - E = 2
$\Rightarrow$ y + 12 - 18 = 2
$\Rightarrow$ y - 6 = 2
$\Rightarrow$ y = 2 + 6
$\Rightarrow$ y = 8