



 
John,
The ditch is 2’ wide and yes the sides are straight up and down. Thank you, John
John, The volume of the ditch is the area of the crosssection times the width of 2 feet. If the slope from the deep end to the shallow end is gradual then the crosssection is a trapezoid. The area of a trapezoid is the average of the lengths of the parallel sides times the distance between the parallel sides. This in your situation is
Thus the volume of the ditch is
There are 27 cubic feet in a cubic yard so the volume is 1800/27 = 66.67 cubic yards. Penny  


Math Central is supported by the University of Regina and The Pacific Institute for the Mathematical Sciences. 