Question

Hello, I'm on confused about the formula is -2 verices?

Answer 1

Euler's formula

Faces + Vertices - Edges = 2

Substituting with

• Faces = 7

,

• Vertcies = 5

we get:

7 + 5 - Edges = 2

12 - Edges = 2

Subtracting 12 at both sides of the equation:

12 - Edges - 12 = 2 - 12

-Edges = -10

Dividing by -1 at both sides of the equation:

`\begin{gathered} (-Edges)/(-1)=(-10)/(-1) \\ Edges=10 \end{gathered}`