The area of a trapezium-shaped field is 600 m2, the distance between two parallel sides is 15m and one of the parallel sides is 20 m. Find the other parallel side.
The area of trapezium of = 12 × (Sum of the length of the two parallel lines) × (distance between two parallel lines).
600 = 12 (a + b) × 15
a + b = 80
b = 80 – 20 = 60m
Length of the other parallel side = 60m