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If the area of a circle C is A and there are n circles of radius r that do not overlap, inscribed on C, what is r?

I was thinking of A = n(pi)r^2, or the area of C equals the sum of the areas of the circles with radius r to get r, but since there is space in between the circles that is not occupied by them, (since the circles do not overlap with each other) then that equation must be wrong.

Help please?

Thank you

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# Annoying circle question

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