Geometry

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I need help on a problem that's on formula for circumference. A circle has a circumference of 36 cm. find it's radius .but it says give an exact answer in simplest form and it says enter pi for the symbol of pie .

  • Geometry -

    C = pi * r^2

    36 = 3.14 * r^2

    36/3.14 = r^2

    11.464968 = r^2

    3.3859958 = r

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