T1R12=T2R2\rm{\dfrac{T_{1}}{R_{1}^{2}}=\dfrac{T_{2}}{R_{2}}}R12T1=R2T2
T12R13=T22R23\dfrac{\mathrm{T}_{1}^{2}}{\mathrm{R}_{1}^{3}}=\dfrac{\mathrm{T}_{2}^{2}}{\mathrm{R}_{2}^{3}}R13T12=R23T22
T13R12=T23R12\rm{\dfrac{T_{1}^{3}}{R_{1}^{2}}=\dfrac{T_{2}^{3}}{R_{1}^{2}}}R12T13=R12T23
T12R1=T22R2\rm{\dfrac{T_{1}^{2}}{R_{1}}=\dfrac{T_{2}^{2}}{R_{2}}}R1T12=R2T22