Law Of Cosines

#Math

$\displaystyle C^{2}=A^{2}+B^{2}-2AB\cos \theta$

• Can be derived by finding dot product of $\displaystyle \vec{c}=\vec{a}-\vec{b}$ with itself
• $\displaystyle \theta$ is the angle between $\displaystyle \vec{a}$ and $\displaystyle \vec{b}$