T∝r3T \propto r^{3}T∝r3
T∝r2\mathrm{T} \propto \mathrm{r}^{2}T∝r2
T2∝r3\mathrm{T}^{2} \propto \mathrm{r}^{3}T2∝r3
T3∝r2T^{3} \propto r^{2}T3∝r2