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30 January, 04:20

A circle has an area of 441π cm2. What is the circumference?

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Answers (2)
  1. 30 January, 04:26
    0
    A = πr^2

    r^2 = 441 π/π

    r^2 = 441

    r = 21

    C = 2 πr

    C = 2 π (21)

    C = 42 π

    answer

    42 π cm
  2. 30 January, 05:12
    0
    A = πr^2

    441π = πr^2

    441 = r^2

    21 = r

    C = 2rπ

    = 2 (21) π

    = 42π cm^2 or 131.88 cm^2
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