Chapter E, Problem 11.3EX

To determine

To find the circumference of the circle.

Answer to Problem 11.3EX

Option (b)

Explanation of Solution

Given information: Area of the circle is $25\pi$

Concept used:

Let $r$ be the radius of the circle, then

  $\begin{array}{l}\text{Area}=\pi r^2\\ \text{Circumference}=2\pi r\end{array}$

  $\begin{array}{l}\text{Area}=\pi r^2=25\pi \\ r=5\end{array}$

  $\text{Circumference}=2\pi r=10\pi$

Hence, the circumference of the circle is $10\pi$ .