Determine the volume in cubic yards of the borrow pit shown in the illustration. The notations at the corners are the depth of cut in feet. 

notations at the corners are the depth of cut in feet. 40 50 ft 50 ft 50 ft 40 ft 20ft h 25 ft 2.4 2.2 87 Y OS 3.4 50 ft y OS 2.8 I'E O'E 9'E 2.8 2.5 3.2 4.2 87 3.2 3.0