Curvature of a polar equation?

Question

does anyone know how to prove the curvature of a polar equation (r = F(θ))? Or do you have any websites that shows how to prove it? Really need help, tnx...

Answer 1

Here's a hoary old text on this subject of finding the radius of curvature given a polar equation, go to section 104. (Warning, 19h century stuff).