It is given that,area of trapezium = 34 cm2 and height = 4 cm Let the length of one parallel side be a. We know that,
Area of trapezium = 1/2 (Sum of parallel sides) × (Distances between parallel sides)
34 cm2 = 1/2(10cm + a) x (4cm)
34cm = 2(10cm + a)
17cm = 10cm + a
a = 17cm - 10cm = 7cm
Thus, the length of the other parallel side is 7 cm.