The figure is made up of 4 identical rectangles, J, K, L and M. The perimeter of rectangle J is 144 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 = 144
1 u = 144 ÷ 6 = 24
Breadth of Rectangle K = 24 cm
(b)
Length of Rectangle L
= 2 u
= 2 x 24
= 48 cm
Area of Rectangle L
= 48 x 24
= 1152 cm
2 Answer(s): (a) 24 cm; (b) 1152 cm
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