how to get radius of curvature using vb.net component

Hi,

I tried to get the radius of curvature at specific point on a curve, but all I get with CurvatureAt function is the curvature vector. Is there any way to get the radius of the curvature using vb.net component? I know that you can get it with Grasshopper's Curvature component  but couldn't find the reference how to get  it using script.

Thank you