File:FS QH bw.png

0) Area of the base square ${\displaystyle A_{0}=1}$
1) Area of the semicircle ${\displaystyle A_{1}=\pi \cdot (3-2{\sqrt {2}})\approx 0.539}$
B) Area of black color: ${\displaystyle B=A_{0}-A_{1}=1-\pi \cdot (3-2{\sqrt {2}})\approx 0.461}$

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