Question

Work out the area of a rectangle with base, b =
18mm and perimeter, P = 60mm.
b b

Answer 1

Area of rectangle = 216 square mm

Explanation:

Base (b ) = 18 mm

width = 'x' mm

Perimeter of rectangle = 2*(base + width)

Perimeter = 60 mm

2*(base + width) = 60 mm

2 *(18 + x ) = 60

2*18 + 2*x = 60

36 + 2x = 60

2x = 60 - 36

2x = 24

x = 24/2

x = 12

Width = 12 mm

Area of rectangle = base * width

= 18 * 12

= 216 square mm