Given: Area of trapezium =350m2 Two parallel side are 25 m and 10 m Formula used: Area of trapezium = (1/2) × (Sum of Parallel sides) × (Distance between Parallel sides) Calculation: Let d is the distance between 2 parallel sides Area of trapezium = (1/2) × (Sum of Parallel sides) × (Distance between Parallel sides) ⇒350=(1/2)×(25+10)×d ⇒700=35×d ⇒d=20m ∴ Distance between two parallel sides is 20 m.