Question

8. The circumference of a ctrcle whose area is 81Pi R Square is what
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Answer 1

Answer:

Area of circle=πr^2

Circumference=2πr

Given

Area=81πr^2

A=πr^2

A/π=πr^2/π

A/π=r^2

r=√A/π

C=2π√A/π

C=2√A.π

C=2√81πr^2.π

C=18πr

Hope u understood........

Step-by-step explanation: