How does one go about measuring the curvature of an object? Is there a way to uniquely represent a geometry if it follows an arbitrary curvature? I'm not even sure if I'm asking the right question, so here's why I want to know. I want to start modeling things in Solidworks to get a feel for the program. I've picked a few random objects that I'd like to start with (I'm doing a yoyo right now) and I'm trying to get them as close as possible to their true geometries. I'm stuck at measuring the curvature of the yoyo. I've used the fillet tool to eyeball it, but is there any way to measure it on the yoyo to be certain? I'm not even sure what tools would exist to attempt this or how it would be represented.