Question

Quantas faces tem um poliedro regular com 30 arestas de 20 vértices ?

Answer 1

v+f = 2 + a
20 + f = 2 + 30
20+f = 32
f = 32-20
f= 12

Answer 2

$A=30\\\\V=20\\\\ F=?\\\\ F+V=A+2\to \\\\ F+20=30+2\to \\\\ F=30+2-20\to \\\\ F=32-20\to\\\\ F=12$


É um dodecágono.