File:FS RCCC bw.png

0) Area of the base triangle ${\displaystyle A_{0}=1}$
1) Area of the inscribed circle ${\displaystyle A_{1}=\pi \left({\frac {3-2{\sqrt {2}}}{2}}\right)\cdot \left({\sqrt {2}}\right)^{2}=\pi (3-2{\sqrt {2}})\quad \approx 0.539}$
2) Area of the second inscribed circle ${\displaystyle A_{2}={\frac {\pi }{8}}\cdot \left(2-{\sqrt {2-{\sqrt {2}}}}\right)^{4}\cdot \left(2-{\sqrt {2}}\right)^{4}\quad \approx 0.107}$
3) Area of the third inscribed circle ${\displaystyle A_{3}=A_{2}={\frac {\pi }{8}}\cdot \left(2-{\sqrt {2-{\sqrt {2}}}}\right)^{4}\cdot \left(2-{\sqrt {2}}\right)^{4}\quad \approx 0.107}$
B) Area of black color: ${\displaystyle B=A_{0}-A_{1}-A_{2}-A_{3}\quad \approx 0.246}$

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