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13 February, 02:42

The area of a circle is 78.5 cm2. What is the diameter of the circle?

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  1. 13 February, 02:49
    0
    Hello:

    The area of a circle is : A = π * r²

    r² = A / π

    r² = 78.5/3.14

    r² = 25

    r = 5

    but : d = 2r ... r : ridus and d : the diameter

    so : d = 10
  2. 13 February, 03:02
    0
    Your answer is 157, i'm pretty sure
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