# 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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