Question

The area of a trapezoid is 180⁢cm2 . The height is 18⁢cm and the length of one of the parallel sides is 5⁢cm . Find the length of the second parallel side. Express your answer as a simplified fraction or a decimal rounded to two places

Answer 1

The formula for area of a trapezoid is (b1+b2)/2*h

(5+x)/2*18= 180

Divide bith sides by 18
(5+x)/2=10

Multiply both sides by 2
5+x=20

Subtract 5 from both sides
x=15

Final answer: 15 cm