If the area of a trapezium is 28 cm2 and one of its parallel sides is 6 cm, find the other parallel side if its altitude is 4 cm.
Let the length of other parallel side of trapezium = 
Length of one parallel side of trapezium = 
Area of trapezium = 28 cm2
Length of altitude of trapezium = 4 cm
Area of trapezium = 
28 = 
Therefore the length of other parallel side of trapezium = 
18