How much is shaded?

Geometry Level 4

Consider the above configuration. The largest circle has radius one, and each circle has radius 1 3 \frac{1}{3} of the previous. Consider the pattern continuing infinitely with infinitely many circles and every second circle being shaded in the above way. If this results in a b \frac{a}{b} of the circle's area being shaded (with coprime positive integers a and b), find a + b a+b .


The answer is 19.

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