The cross-section of a canal is a trapqzium in shape. If the canal is 10 m wide at the top 6 m wide at the bottom and the area of cross-section is 72 m2 determine its depth.
Length of parallel sides of trapezium = 10m and 6m
Distance between parallel sides of trapezium = x meter
Area of trapezium =
Therefore depth of river is 9m