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.
Area of a trapezium = 28 cm2
Altitude (h)=4 cm
∴ Sum of parallel sides=Area×2height=28×24=14 cmOne of the parallel side=6 cm∴ Second parallel side=14−6=8 cm