# math

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a pool in the shape of a circle measures 10 feet across. One cubic yard of concrete is used to create a circular border of uniform width around the pool. If the border is to have a depth of 3 inches, how wide will the border be (1 cubic yard=27 cubic feet)

• math -

area of border= (outerradius^2-innerradius^2) * PI

27= 1/4 ft*area border

solve for outerradius.

• math -

19.625

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