# Why do you need to find the distance between two polar coordinates?

Let say you have points A(r_1,θ_1),Β(r_2,θ_2) you must convert them to cartesian coordinates A(x_1,y_1),Β(x_2,y_2) and then use the distance formula $D = \sqrt{{\left({x}_{2} - {x}_{1}\right)}^{2} + {\left({y}_{2} - {y}_{1}\right)}^{2}}$