SOLUTION: A dam is 40 ft. long, 12 ft. high, 7 ft. wide at the bottom, and 4 ft. wide at the top. How many cubic yards of material were used in constructing it?

Algebra ->  Triangles -> SOLUTION: A dam is 40 ft. long, 12 ft. high, 7 ft. wide at the bottom, and 4 ft. wide at the top. How many cubic yards of material were used in constructing it?       Log On


   

Question 918552: A dam is 40 ft. long, 12 ft. high, 7 ft. wide at the bottom, and 4 ft. wide at the top. How many cubic yards of material were used in constructing it?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
.
Area of the face = %28%287%2B4%29%2F2%2912= 66ft^2
V = 66%2AL+=+66ft%5E2%2A40ft = 2640 ft^3
(sweeping the face the length of 40ft)