Correct Answer - Option 2 : 4800
Given:
Perimeter of rectangle = 320 cm
Length of a rectangle = 3 times of its breadth
Concept:
Perimeter of rectangle = 2(l + b) cm [l = length, b = breadth]
Calculation:
Let, breadth of the rectangle = x cm
Length of the rectangle = 3x cm
According to the question,
⇒ 2(x + 3x) = 320
⇒ 8x = 320
⇒ x = 40
Length of rectangle = 3x = 3 × 40 = 120 cm
Breadth of rectangle = x = 40 cm
∴ Area of rectangle = (120 × 40) cm2 = 4800 cm2