Question

The perimeter of a rectangle is 79cm. One side is three times the length of the other. From an equation and hence find the length of each side

Answer 1

Explanation:

Make the length of one side = 'x'

The other side = 3xPerimeter = 2 x one side + 2 x the other side

79 cm = 2(x) + 2(3x)

79 cm = 2x + 6x

8x = 79

x = 9.875

One side = 9.875 cm

Other side = 29.625 cm