R=d26+h2\mathrm{R}=\dfrac{\mathrm{d}^{2}}{6}+\dfrac{\mathrm{h}}{2}R=6d2+2h
R=d22+h6\mathrm{R}=\dfrac{\mathrm{d}^{2}}{2}+\dfrac{\mathrm{h}}{6}R=2d2+6h
R=d26 h+h2\mathrm{R}=\dfrac{\mathrm{d}^{2}}{6 \mathrm{~h}}+\dfrac{\mathrm{h}}{2}R=6 hd2+2h
R=d212+h2\mathrm{R}=\dfrac{\mathrm{d}^{2}}{12}+\dfrac{\mathrm{h}}{2}R=12d2+2h