The area of a circle is 81 pi in2 what is the circumference in inches express ur answer in terms of pi

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The area of a circle is 81 pi in2 what is the circumference in inches express ur answer in terms of pi

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Trung Dũng 3 years 2021-07-16T06:30:49+00:00 1 Answers 13 views 0

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  1. thnahdat
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    2021-07-16T06:32:12+00:00
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    Answer:

    Circumference of circle = 18π inches

    Step-by-step explanation:

    Given the following data;

    Area of circle = 81π in²

    To find the circumference;

    First of all, we would find the radius of the circle using the area of circle formula.

    Area of circle = πr²

    Substituting into the formula, we have:

    81π = πr²

    Dividing both sides by π, we have;

    81 = r²

    Taking the square root of both sides, we have;

    r = 9 inches

    Now, to find the circumference of the circle;

    Circumference of circle = 2πr

    Circumference of circle = 2*π*9

    Circumference of circle = 18π inches.

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