Question

Don builds a pyramid using balls. The square base consists of 3 x 3 balls. The middle layer has 2 x 2 balls, and there is one ball at the top. Any two balls that touch each other are glued at their contact point. How many glued contact points are there? A. 20 B. 24 C. 28 D. 32 E. 36

Answer 1

The answer is 24 contact points

this is a bad drawing but here’s the pyramid and all the white lines are where they would have contact points to be glued.