Disc Radius is actually Diameter?

Please bear with me here, as I've been going nuts on this.  It is ENTIRELY possible I'm wrong here - in fact that's the most likely issue - but it really seems like the Radius in a Shapes Disc is actually its Diameter.

Exhibit A: If I make a Disc with a scale of 1 and a Radius of 1, then compare it to a Unity Unit Sphere of scale 1, they are the same size.  But a Unity Unit Sphere has a Diameter of 1, not a Radius of 1.

Exhibit B: If I make a Disc with a scale of 1, and a Radius of 1.59155, then set the Dashed line to be in Meters, with a Size of 2m, I get 3 dashed segments, but a circle with a radius of 1.59155m should have a circumference of 10m, thus with 2m segments I should get 5 segments, not 3.  If I change the radius to be 3.1831, I suddenly get 5 segments as expected for a circumference of 10m which is what is expected of a circle with a Diameter of 3.1831, not radius.