Asked by Michelle

Find the number of vertices in a polyhedron if it contains 20 triangular faces and 12 pentagonal faces.

a. 30
b. 32
c. 60
d. 120

* Also please show me how you got your answer, thanks
Answered by Steve
Recall Euler's Formula:

V+F-E=2

and check out

https://en.wikipedia.org/wiki/Icosidodecahedron