Question

Question 70 (i)

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

Faces 7
vertices 10
Edges x

Answer 1

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