The figure is made up of 4 identical rectangles, B, C, D and E. The perimeter of rectangle B is 78 cm.
- What is the breadth of rectangle C?
- Find the area of rectangle D.
(a)
Rectangles B, C, D and E are identical.
Breadth of Rectangle B = 1 u
Length of Rectangle C = 2 u
Perimeter of Rectangle B
= 1 u + 1 u + 2 u + 2 u
= 6 u
6 u = 78
1 u = 78 ÷ 6 = 13
Breadth of Rectangle C = 13 cm
(b)
Length of Rectangle D
= 2 u
= 2 x 13
= 26 cm
Area of Rectangle D
= 26 x 13
= 338 cm
2 Answer(s): (a) 13 cm; (b) 338 cm
2