Question

1. use eulers formula to find the missing number.

faces: ___
edges: 15
vertices: 9
8
22
10
6

Explanation:

Step1: Recall Euler's Formula

Euler's Formula: $V - E + F = 2$

Step2: Substitute known values

Given $V=9$, $E=15$, let $F$ be the number of faces.
$9 - 15 + F = 2$

Step3: Solve for $F$

$-6 + F = 2$
$F = 2 + 6 = 8$

Answer:

8