OptionaltoWhere the arc ends, in the sketch's x and y.
OptionalsagittaHow far the arc's middle stands off the straight line between its ends, in model units: positive to the left of travel, negative to the right.
OptionalrelativeWhen true, to is an offset from where the pen is rather than a point of the sketch.
OptionalidA name for the command, reported with the edges it draws; leave it out to be named by position.
A point to end at and how far the arc stands off the straight line to it, for
sketch.commands.sagittaArc, which makes the circular arc commandsketch.pendraws.