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sector
Sectors are the like a "pie slice'' from a circle. The radius of
the circle is set by dy. Sectors are defined similarly to
segments. In this case, though, a chord is not drawn. Instead,
the lines are drawn from the origin of the circle (0,-dy)
to the points (-dx,0) and (dx,0). The perimeter
of the circle is then drawn between those two points and lies
below the x-axis. The sector is then rotated and translated the
same as a segment.