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25 August, 06:17

The area of a circle is 286 cm2. Use the π button on your calculator for π in your calculations.

8a

If its radius is r cm, find r, correct to 2 decimal places.

Be careful not to round your answer until the very end.

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Answers (1)
  1. 25 August, 06:38
    0
    9.54 cm

    Explanation:

    area = πr^2

    286 cm^2 = πr^2

    =>πr^2 = 286 cm^2

    =>r^2 = 286:π

    =>r = √286:π

    : 9.54. m

    circumference=2πr

    => circumference=2*π*9.54

    =60 cm
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