Question

Radius of a circle is 9 cm.What is the area of the circle ?​

Answer 1

Explanation:

You just need to use the formulas:

Area =

r² *π = 9² *π= 81.π

Circumference =

2*r*π = 2*9 *π = 18.π

Answer 2

Concept

The formula to calculate area of the circle is $A=\pi r^{2}$

The radius of the circle is represented by r.

Given

A circle radius is 9 centimeters.

Find

We have to find the area of the circle.

Solution

Apply the formula of the area of the circle.

then $A=\pi (9)^{2}$

            $=81\pi cm^2$

Hence the area of a circle is $81\pi cm^2$.