The area of a circle is 80.86cm2. Find the length of the radius rounded to 2 DP.

Question

The area of a circle is 80.86cm2.
Find the length of the radius rounded to 2 DP.

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Mộc Miên 6 months 2021-07-21T01:46:19+00:00 1 Answers 4 views 0

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  1. kimcuc
    0
    2021-07-21T01:47:44+00:00
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    Answer:

    Solution given:

    The area of a circle =80.86cm²

    we have:

    The area of a circle =πr²

    substituting value of area of circle we get

    80.86cm=3.14*r²

    dividing both side by 3.14

    80.86/3.14=3.14*r²/3.14

    25.75=r²

    doing square root on both side

    \sqrt{25.75}=\sqrt{r²}

    r=5.07cm

    The length of radius is 5.07cm

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