Question

A rope is made round to cover an area of 154 cm then the length of the rope is

• A. 66 cm
• B. 132 cm
• C. 44 cm
• D. 88 cm

Answer 1

The correct option is C 44 cm

Let the radius of this circle be R.
$\pi R^2=154$

$\frac{22}{7}\times R^2=154$

$R=7cm$

Length of the rope required is the circumference of the circle $=2\pi r=2\times \frac{22}{7}\times 7=44cm$