Hello candidate,

K=|(r^2+2(r')^2-rr'')| / (r^2+2(r')^2)^(3/2), the radius of curvature is given by 1/K.

But in order to completely solve such mathematical expressions there are limited answering options, and so it's not possible on my part to provide you with the exact solution because of such limitation.

Feel free to ask any other theory Related Questions!!

Have a good day.