Question

The area of the circle above is 1,661.06 units2. What is the circumference of the circle? (Use 3.14 for .)

A.
144.44 units
B.
72.22 units
C.
830.53 units
D.
553.69 units

Answer 1

Formula for Area of circle :

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Area of a circle = πr²

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Find radius :

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1661.06 = 3.14 x r²

r² = 1661.06 ÷ 3.14

r² = 529

r = √529

r = 23 unit

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Formula for Circumference :

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Circumference = πD

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Find Circumference :

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Circumference = 3.14 x (2 x 23)

Circumference = 144.44 unit

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Answer: Circumference - 144.44 unit

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