Default UI Menu: Draw/Arc/Double Point
Ribbon UI Menu:
Creates an arc by defining two endpoints of its diameter.
\1. Select a point on the circumference of the circle from which the arc will be cut.
\2. Select the point on the opposite end of the diameter line, or enter the radius, diameter or circumference, and angle of the diameter line in the Inspector Bar.
\3. A dotted line appears from the centerpoint. Move the cursor to set the arc start angle, or enter the angle in the Inspector Bar.
\4. Move the cursor counterclockwise to draw the arc, or enter the end angle or arc length in the Inspector Bar.