Question

If the area of a circle is 81pi square feet, find its circumference.

Answer 1

Answer:

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Step-by-step explanation:

area = 81 pi ft²

pi × r² = 81 × pi

r² = 81. (Cutting pi from both sides )

.°. r = √81

.•. r = 9. ------------------------- (1)

circumference = 2×pi×r

2 × pi × r

= 2 × 3.14 × 9 ( From 1 )

= 56.52

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