The figure is made up of 4 identical rectangles, J, K, L and M. The perimeter of rectangle J is 72 cm.
- What is the breadth of rectangle K?
- Find the area of rectangle L.
(a)
Rectangles J, K, L and M are identical.
Breadth of Rectangle J = 1 u
Length of Rectangle K = 2 u
Perimeter of Rectangle J
= 1 u + 1 u + 2 u + 2 u
= 6 u
6 u = 72
1 u = 72 ÷ 6 = 12
Breadth of Rectangle K = 12 cm
(b)
Length of Rectangle L
= 2 u
= 2 x 12
= 24 cm
Area of Rectangle L
= 24 x 12
= 288 cm
2 Answer(s): (a) 12 cm; (b) 288 cm
2