The area of a trapezium is 34 cm2 and the length of one of the parallel sides is 10 cm and its height is 4 cm.

Area of trapezium = 1/2 (a + b) × h = 34 cm²

Here, a = 10cm, h = 4cm, b = ?

Then, 1/2 (10 + b) × 4 = 36

b = 8 cm