R=4hh′\mathrm{R}=4 \sqrt{\mathrm{hh}^{\prime}}R=4hh′
R=hh′\mathrm{R}=\sqrt{\mathrm{hh}^{\prime}}R=hh′
R2=4hh′\mathrm{R}^{2}=4 \sqrt{\mathrm{hh}^{\prime}}R2=4hh′
R=4hh′\mathrm{R}=4 \mathrm{hh^{ \prime }}R=4hh′