Question

Which gives an area of a rectangle with a width of 36 cm and a perimeter of 80 cm

A. 144 cm2
B. 288 cm2
C. 1296 cm2
D. 1440 cm2
E. 2880 cm2

Answer 1

A. 144 cm2

Explanation:

Area = length * width = x

Perimeter = 2(length) + 2(width) = 80

2(width) is equal to 72 (double the given width). The remaining 8 is equal to 2(length).

Divide 8 by 2 to get 4, the length of the unknown side.

Back to the area formula, width (36) times length (4) = 144

144 cm^2