How do I find the amount of polygons and vertices in inventor?

Inventor uses parametric modeling, which means that all shapes are based on mathematical equations rather than collections of polygons and vertices. An Inventor model is to a vector image as a polygonal model is to a raster image; they use completely different principles. However, you can export an IPT or and IAM to an STL file, which is a polygonal model format. If you have a mainstream modeling program that can open STL files, it can tell you how many triangles and vertices are on the model you exported. If you are cost-conscious, the best program to use for this IMO is Blender. It's tricky to learn but I've manipulated exported models from Inventor in it before for game design purposes.

What you have asked about is not IV and more 3D's Max or Maya.....