You have a circle of radius 'r'. In it are 'n' congruent circles of radius 'a' such that each circle (except the big circle) touches exactly two congruent circles and the large circle. find 'a' in terms of 'r' and 'n'.

it's not as hard as it sounds. It took me under five minutes, but its still interesting.

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You have a circle of radius 'r'. In it are 'n' congruent circles of radius 'a' such that each circle (except the big circle) touches exactly two congruent circles and the large circle. find 'a' in terms of 'r' and 'n'.

it's not as hard as it sounds. It took me under five minutes, but its still interesting.

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