SOLUTION: A trench is 200 ft. long and 12 ft. deep, 8 ft. wide at the top and 4 ft. wide at the bottom. How many cubic yards of earth have been removed?

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Question 918548: A trench is 200 ft. long and 12 ft. deep, 8 ft. wide at the top and 4 ft. wide at the bottom. How many cubic yards of earth have been removed?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
.
Area of the face = %28%288%2B4%29%2F2%2912= 72ft^2
V = 72%2AL+=+72ft%5E2%2A200ft = 14,400 ft^3
(sweeping the face the length of 200ft)