Kolo Mohra: Środek koła σ_1/2=$\frac{\sigma_{x} - \sigma_{y}}{2}$; σ_1/2=σ_max, min=$\frac{\sigma_{x} - \sigma_{y}}{2} \pm \sqrt{{(\frac{\sigma_{x} - \sigma_{y}}{2})}^{2} - \tau_{\text{xy}}^{2}}$, Tg2$\alpha = \frac{2\tau_{\text{xy}}}{\sigma_{y}{- \sigma}_{x}}$