R=\frac{1}{2}D=\frac{a\sqrt3}{2}=\frac{4\sqrt3}{2}=2\sqrt3 promień kuli
V_{sz}=a^3=4^3=64[cm^3]
V_k=\frac{4}{3}\pi R^3=\frac{4}{3}\pi *(2\sqrt3)^3=\frac{4}{3}\pi *8*(\sqrt3)^2*\sqrt3=\frac{32\pi}{3}*3*\sqrt3=32\pi \sqrt3[cm^3]
\frac{V_{sz}}{V_k}=\frac{64}{32\pi \sqrt3}=\frac{2\sqrt3}{\pi *\sqrt3*\sqrt3}=\frac{2\sqrt3}{3\pi}