Henry had a piece of wire 240 cm long. He used it to form a rectangle with its length and breadth in the ratio 7 : 3.
- What is the length of the rectangle?
- What is the area of the rectangle?
(a)
Length of the rectangle = 7 u
Breadth of the rectangle = 3 u
Perimeter of the rectangle
= 2 x 7 u + 2 x 3 u
= 14 u + 6 u
= 20 u
20 u = 240
1 u = 240 ÷ 20 = 12
Length of the rectangle
= 7 u
= 7 x 12
= 84 cm
(b)
Breadth of the rectangle
= 3 u
= 3 x 12
= 36 cm
Area of the rectangle
= 84 x 36
= 3024 cm
2 Answer(s): (a) 84 cm; (b) 3024 cm
2