Question 350808
The cross section area of canal is a trapezium. 
 Parallel sides are 2 and 4, height is 2 m.
 
 area of this trapezium =  1/2 × (sum of parallel sides) × (distance between them)
                         
                         = 1/2 * (2+4) * 2 
                        
                         = 6  m sq.

volume  = 6 * 10000           (10 km = 10000 m)
        = 60000 m cube.



so, 60000 cubic meters excavated.