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Some assistance needed.

  1. Nov 28, 2003 #1
    I need help with this word problem.

    What is the radius of a circle whose area is 154 square centimeters?
    I know i'm suppost to use the formula [itex] A={\pi}r^2 [/itex].
    What do I need to do next?
  2. jcsd
  3. Nov 29, 2003 #2
    You know that [tex]A[/tex] (the area) is 154 (square centimetres) so its merely a case of substituting [tex]A=154[/tex] into the formula and solving for r (given that [tex]{\pi}[/tex] is a known value).
  4. Nov 30, 2003 #3
    154 = π r^2

    r^2 = 154 / π

    r = sqrt(154 / π)

    r = sqrt(7 * 154 / 22) [as π = 22 / 7 (approximately)]

    r = sqrt(7 * 7)

    r = 7cm
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