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OpenStudy (anonymous):

The radius of a circle of area A and circumference C is doubled. Find the new area in terms of A.

OpenStudy (joannablackwelder):

When A is the area of a circle with radius r, A=pi*r^2. When the radius doubles, r becomes 2r, so the new area is pi*(2r)^2, which simplifies to 4pir^2. Substituting A=pir^2, the new area is 4A.

OpenStudy (joannablackwelder):

Sorry, @tomgetty, but I disagree.

OpenStudy (anonymous):

@JoannaBlackwelder yup you're right!

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