The figure below shows an equilateral triangle ABC with the inscribed circle of radius r, 3 yellows circles of radius a, 7 green circles of radius b, 6 white circles of radius c and circles C1 touch each other as shown.
Reference: Fukagawa Hidetoshi, Tony Rothman, Sacred Mathematics: Japanese Temple Geometry (Princenton University Press, 2008).
Geometric art is a form of art based on the use and application of geometric figures. A geometric figure is any set or combination of points, lines, surfaces and solids.
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Original problem 1081.