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19 December, 12:37

Estimate the length of the radius, if the area of a circle is 750 mm2.

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Answers (2)
  1. 19 December, 12:56
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    Well, the area of a circle = pi * r^2. You know the area and the value of pi so solve for r (the radius).

    750/pi = r^2

    Square root (750/pi) = r.

    The radius of your circle is 5*square root (30/pi) or approximately 15.45
  2. 19 December, 14:48
    0
    Since the area of a circle is PiR^2, we need to divide by Pi, then square root the remaining answer.

    750/3.14 = 238.85

    The sq rt of 238.85 = 15.45

    The radius is ~15.5mm or 16mm if rounded.
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