The figure is made up of 4 identical rectangles, D, E, F and G. The perimeter of rectangle D is 60 cm.
- What is the breadth of rectangle E?
- Find the area of rectangle F.
(a)
Rectangles D, E, F and G are identical.
Breadth of Rectangle D = 1 u
Length of Rectangle E = 2 u
Perimeter of Rectangle D
= 1 u + 1 u + 2 u + 2 u
= 6 u
6 u = 60
1 u = 60 ÷ 6 = 10
Breadth of Rectangle E = 10 cm
(b)
Length of Rectangle F
= 2 u
= 2 x 10
= 20 cm
Area of Rectangle F
= 20 x 10
= 200 cm
2 Answer(s): (a) 10 cm; (b) 200 cm
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