Question

The length of a rectangle is 40 cm. If its breadth is half the length, the perimeter is :

• A. 1200 cm
• B. 1.2 cm
• C. 120 m
• D. 120 cm

Answer 1

The correct option is D

120 cm

Given, the breadth is half of the length.
$\therefore b=\frac{l}{2}$
Given length $l=40cm$
$\Rightarrow b=20cm$

Perimeter of a rectangle $=2(l+b)$
$\Rightarrow 2(40+20)$
$\Rightarrow 2\left(60\right)$
$\Rightarrow 120cm$