Description :
Draws an arc. The default method of drawing arcs is selecting three points (so-called 3 point arc), which are the two endpoints of the arc and some other point along its locus. Other methods of drawing an arc can be specified by three letters, such as SEA, which means Start Point, End Point, and Included Angle.
A Included angle C Center point of arc D Direction angle of a line tangent to the arc E Endpoint of arc L Length of chord passing thru both endpoints of the arc R Radius S Start point of arc <RET> uses the end of the last line or arc as the start point for the arc
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