PLZ HELP!!!!

A pedestal in a craft store is in the shape of a triangular prism. The bases are right triangles with side lengths of 9 inches, 12 inches, and 15 inches. The store owner wraps a piece of rectangular cloth around the pedestal, but does not cover the identical bases of the pedestal with cloth. The area of the cloth is 252 square inches.

Part 1 out of 2
Complete the explanation for the distance around the base of the pedestal and how to find it.

The distance is __ inches; the base is a ___ with ___ 9 ___ 12 ___ 15 = ____ in.