Question

If the area of a circle is $154{cm}^2$ , what is the perimeter of the circle?

Answer 1

Let the radius of a circle be $rcm$

Given Area of the circle is $154c{m}^2$

$⟹\pi r^2=154$

$⟹r^2=154\times \frac{7}{22}=7^2$

$⟹r=7$

Perimeter of the circle is $2\pi r=2\times \frac{22}{7}\times 7=44cm$