Polygon: Use inner instead of outer radius

When creating a polygon, I often want to be able to create it with a radius based on the middle segment. For example, with hexagons:

### What the radius currently sets

### What I want to set as the radius

I don't know how this should be implemented. Should it be a toggle? It could be a simple custom component with a relatively simple trigonomery node also. Should it be implemented directly within the editor?

I currently don't realize what is the scope of these nodes. Should they be general? Should the provide the bare minimum to be composable into any wanted node?