Question

the length of a rectangle is four times its width. if the area of the rectangle is 400 m2 find the perimeter

Answer 1

area = length x width

400 = 4w x w

400 = 4w^2

100 = w^2

w = 10

400 = length x 10

40 = length

10 = width

40 + 40 + 10 + 10 = 100

the perimeter is 100 unit