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RobertLovesPi.net 
I’m tempted to calculate the area of a selected region. I’m thinking that calculus may
provide a more expedient procedure; I’m thinking polar coords. and iterated integrals. I’m assuming the ctr. of one is on the locus of an adjacent. Copy that?
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The centers of the circles are at each of the the vertices of two concentric regular pentagons — one large, and one small. Also, each of these vertices is the center of two circles of different sizes.
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