Question

Using Euler's formula, find $V$, if $E=30,F=12$

Answer 1

Euler's Formula is $F+V-E=2$, where $F$= number of faces

$V$ = number of vertices, and $E$ = number of edges.

So, $12+V-30=2$
$⟹V=30+2-12$

Hence $V=20$