The figure is made up of 4 identical rectangles, H, J, K and L. The perimeter of rectangle H is 126 cm.
- What is the breadth of rectangle J?
- Find the area of rectangle K.
(a)
Rectangles H, J, K and L are identical.
Breadth of Rectangle H = 1 u
Length of Rectangle J = 2 u
Perimeter of Rectangle H
= 1 u + 1 u + 2 u + 2 u
= 6 u
6 u = 126
1 u = 126 ÷ 6 = 21
Breadth of Rectangle J = 21 cm
(b)
Length of Rectangle K
= 2 u
= 2 x 21
= 42 cm
Area of Rectangle K
= 42 x 21
= 882 cm
2 Answer(s): (a) 21 cm; (b) 882 cm
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