Question 757604
both circles have the same center, and the radius of the larger circle is r. if the radius of the smaller circle 3 units less than r, which of the following represents the areas of the shaded regions?
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Nothing followed.
{{{Area = pi*r^2 - pi*(r-3)^2}}}
= {{{pi*(6r - 9)}}} for r >= 3
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PS  It's not necessary that they have the same center.