Question

A polyhedron is having 20 vertices and 30 edges.Its number of faces are .
A-12
B-13
C-15
D-14

Answer 1

Solution :

A - 12

Euler's polyhedron formula, V−E+F=2

V= number of vertices

E= number of edges

F= number of faces

So, 20−30+F=2

F−10=2

F=10+2

F=12

Number of faces =12.