Posted by **Sam** on Sunday, August 5, 2012 at 11:12am.

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

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**Ms. Sue**, Sunday, August 5, 2012 at 12:13pm
A = pi * r^2

A = 3.14 * 1.5^2

A = 2.25 sq. yards

25 * 2.25 = $______ cost

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**Sam**, Sunday, August 5, 2012 at 3:20pm
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".

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**Steve**, Sunday, August 5, 2012 at 5:43pm
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!)

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**Sam**, Sunday, August 5, 2012 at 7:15pm
Thank you so much.

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