SOLUTION: A trench is 150m long and 10m deep, 6m wide at the top and 3m at the bottom. How many cubic meters of earth have been removed?

Question 1021141: A trench is 150m long and 10m deep, 6m wide at the top and 3m at the bottom. How many cubic meters of earth have been removed?
Answer by Cromlix(4381) (Show Source): You can put this solution on YOUR website!
Hi there,
Looking at the face of the trench
it can be divided into a rectangle in
the middle of two triangles.
Area of rectangle = 3m x 10m = 30 m^2
Area of two triangles together
1/2 (3 x 10) = 15 m^2
Total face area = 30 + 15 = 45 m^2
Face area x Length
45m^2 x 150m
= 6750 m^3
This is the amount of earth removed.
Hope this helps :-)
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