Sean had a piece of wire 140 cm long. He used it to form a rectangle with its length and breadth in the ratio 3 : 4.
- What is the length of the rectangle?
- What is the area of the rectangle?
(a)
Length of the rectangle = 3 u
Breadth of the rectangle = 4 u
Perimeter of the rectangle
= 2 x 3 u + 2 x 4 u
= 6 u + 8 u
= 14 u
14 u = 140
1 u = 140 ÷ 14 = 10
Length of the rectangle
= 3 u
= 3 x 10
= 30 cm
(b)
Breadth of the rectangle
= 4 u
= 4 x 10
= 40 cm
Area of the rectangle
= 30 x 40
= 1200 cm
2 Answer(s): (a) 30 cm; (b) 1200 cm
2