A frustum of a pyramid is 16cm square at the bottom 6cm squat at the top and 12cm high, find the volume of the frustum

Answer 1

Find the volume if it had a pointy top
(1/3) * area of base * height including top that got removed
Find the volume of the top that got removed
Subtract

Answer 2

A frustum of a pyramid is 16cm square at the bottom. 6cm square at the top, and 12cm high. Find the volume of the frustum