A construction 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 9 feet and the sides have a length of 12 feet. He also
measured one diagonal to be 15 feet. What is the length of the other
diagonal?
OA. 12 feet
B. 21 feet
C. 9 feet
D. 15 feet