Ken had a piece of wire 112 cm long. He used it to form a rectangle with its length and breadth in the ratio 5 : 3.
- What is the length of the rectangle?
- What is the area of the rectangle?
(a)
Length of the rectangle = 5 u
Breadth of the rectangle = 3 u
Perimeter of the rectangle
= 2 x 5 u + 2 x 3 u
= 10 u + 6 u
= 16 u
16 u = 112
1 u = 112 ÷ 16 = 7
Length of the rectangle
= 5 u
= 5 x 7
= 35 cm
(b)
Breadth of the rectangle
= 3 u
= 3 x 7
= 21 cm
Area of the rectangle
= 35 x 21
= 735 cm
2 Answer(s): (a) 35 cm; (b) 735 cm
2