A cone shaped scoop is being used to fill a
cylindrical bucket of water. The scoop and the
bucket have the same height and radius. How
many scoops of water would it take to fill the
bucket 15 times?

The volume of a cone is (one third) of the volume of a cylinder which has the same height as the cone and the same base radius as the cone.

So, you need 3 volumes of cone to fill the cylinder.

square pyramid

step-by-step explanation:

square prism looks like nothing like that

triangular prism has a rectangular base instead of a square base

tetrahedron has a triangular base