Question

The area of a trapezoid is 145cm2. The height is 10cm and the length of one of the parallel sides is 10cm. Find the length of the second parallel side. Express your answer as a simplified fraction or a decimal rounded to two places

Answer 1

19 cm.

Explanation:

Area = h(a + b)/2

where h = height, and a and b are parallel sides,

145 = 10(10 + b)/2

290 = 100 + 10b

10b = 190

b = 19 cm.