If a rectangular prism has a length width and height of 3/8 cm 5/8 cm and 7/8 cm then the volume of the prism is cubic centimeters

Aconstruction worker needs to put a rectangular window in the side of a building he knows from measuring that the top and bottom of the window have a width of 8bfeet and the sides have a length of 15 feet he also measured one diagonal to be 17 feet what is the length of the other diagonal