Does anyone know of a pict constructor for a regular polygon? Or do you need to draw your own?

There are polygons in MetaPict. The function regular-polygon returns a curve. Use draw to turn it into a pict.

Documentation here: https://github.com/soegaard/metapict/blob/master/metapict/polygons.rkt#L12

@soegaard2 Thanks, didn’t think to look there.

There is also a regular-polygon in 2htdp/image

missed that, thanks.

That doesn’t support inradius and circumradius though.

Ok