Question

The circumference of a circle whose area is 81pie, is__​

Answer 1

Given area of a circle is 81π.

We know formula for area of a circle is πr 2

So,πr 2

=81π

⇒r 2

=81

r=9

Formula for circumference is 2πr.

So putting r=9 circumference will be 2π9=18π

Answer 2

Answer:

answer is 18pie

Step-by-step explanation:

so 2 pie r is the circumference of a circle

now pie r square is the area of a circle.

area is equal to 81 pie

no pie r square= 81 pie

now remove square from both sides

irt would be 2 pie= 9 pie

so put pie r into circumference

we would get 2 x 9 pie

= 18 pie

here u go bud