Question

What is the number of vertices in a pyramid with 10 faces?

A.
10

B.
11

C.
20

D.
22

Answer 1

B. 11

Explanation:

If you draw 10 triangles and count the number of vertices on the bottom, you get 10 vertices, because half of the vertices are touching which reduces it to 1. There is also the top vertex connecting all of the triangles together.