Question

PLEASE HELP!!!!

use Euler's formula to find the missing number

faces: 25
verticies: 17
edges: ?

answer choice-
a. 43
b. 41
c. 39
d. 40

Answer 1

d. 40

Explanation:

The number of faces, edges and vertices is related by the following formula:

`V - E + F = 2`

In which V is the number of vertices, E is the number of edges and F is the number of faces.

In this question:

`F = 25, V = 17`

We want to find E. So

`V - E + F = 2`

`17 - E + 25 = 2`

`E = 42 - 2 = 40`

The correct answer is given by option D.