Question

The circumference of circle with area 81 π2 eqval to

Answer 1

Answer:

Answer is 18π

Step-by-step explanation:

Given area of a circle is 81π.

We know formula for area of a circle is πr^2

So,πr^2=81π

⇒r2=81

⇒r=9

Formula for circumference is 2πr.

So putting r=9 circumference will be

2π9=18π

HENCE PROVED.