Question

Use Euler's Formula to find the missing number.

Faces: 25
Vertices: 17
Edges: ?

Answer 1

Using Euler's Formula:

Faces + Vertices - Edges = 2

We can substitute the given values:

25 + 17 - Edges = 2

Simplifying:

42 - Edges = 2

Subtracting 42 from both sides:

-Edges = -40

Dividing both sides by -1:

Edges = 40

Therefore, the missing number is 40.