Find the circumference of a circle whose area is 154 cm^2. please answer me fast .​

Question

Find the circumference of a circle whose area is 154 cm^2.
please answer me fast .​

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Remi 4 days 2021-09-14T10:34:25+00:00 2 Answers 0 views 0

Answers ( )

  1. Answer:

    a=pie radius square

    154*7/22=r square

    49root=r

    7=r

    circumference=2*22/7*7=44

    0
    2021-09-14T10:35:56+00:00

    Given:

    • Area of circle = 154 cm²

    ⠀⠀⠀⠀⠀⠀

    To find:

    • Circumference of circle.

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    Solution

    ⠀⠀⠀⠀⠀⠀

    We need Radius of circle for finding circumference of circle.

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    We know that ,

    ☘ Area of circle = πr²

    In which r is Radius of circle.

    ⠀⠀⠀⠀⠀⠀

    So,

    ⇒πr² = 154

    ⇒ r² = 154 × 7 / 22

    ⇒ r² = 1078/22

    ⇒ r² = 49

    ⇒r = √49

    r = 7

    ⠀⠀⠀⠀⠀⠀

    Verification:

    ⇒πr² = 154

    • Put r = 7

    ⇒π(7)² = 154

    ⇒22/7 × 7 × 7 = 154

    ⇒22 × 7 = 154

    ⇒154 = 154

    Hence, verified

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    Radius of circle = 7 cm.

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    ☘ Circumference of circle = 2πr

    ⇒2 × 22/7 × 7

    ⇒2 × 22

    44 cm.

    ⠀⠀⠀⠀⠀⠀

    Therefore, Circumference of circle is 44 cm.

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