Click on Circle to Reshape it into Ring. All Rings have the SAME AREA. Consider limiting case. See below for details.
These are actually Polygonal Rings.
For thicker slices click on "Step".
For thinner slices enter angle (degrees) into TextField on the left.
"Speed" slows down the process.
"Size" makes the slices longer.
"Oval" changes the shape. Big changes are not perfect yet.