Arc
Creates a circular arc
Button: 
Command name: _arc
Use _arc to create a circular arc by specifying various combinations of values for the centre point, end point, start point, radius, angle, chord length and direction.
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Select one of the displayed command options.
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Centre point: Enter the centre point, radius, start angle and end angle in sequence to draw the arc.
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Enter 3p to specify the start point, end point and radius of the arc in sequence.
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Enter e3p to draw a small or large arc based on a straight line between the start and end points.
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- Confirm the arc with the left mouse button.