Question

the area of a trapezium is 180cm2 and the height is 12 and one of the side is 9 find the size of the parallel side

Answer 1

1/2 × sum of parallel sides × height

it is the formula . by using this

let the second parallel side 'x'

1/2 × 9+x × 12 = 180

9+x×6=180

9+x = 180/6

9+x = 30

x = 30 - 9

x = 21