math

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carpet is $25 per square yard. what is cost of circulare rug 9ft in diameter?

  • math -

    A = pi * r^2

    A = 3.14 * 1.5^2

    A = 2.25 sq. yards

    25 * 2.25 = $______ cost

  • math -

    The formaula works for a rectangle, but this is a circle. How do you convert sides of a circle? The answer is $176.63, but I can't "make it fit".

  • math -

    25 * pi * 2.25 = 176.71

    close enough to me. (Ms Sue dropped the pi on line 3. A typo you could have caught on careful reading and math checking!)

  • math -

    Thank you so much.

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