Given: In a trapezium ABCD, AB = 10cm and CD = 20cm. The height of trapezium is 15cm Concept used: Area of trapezium =1/2(AB+CD)×Height Calculation: According to the formulae place the values in it Area of trapezium =1/2(10+20)×15 ⇒15×15 Area of trapezium =225cm2