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