The Make Arc tool converts one segment of a path into a semicircle.
Hold Shift and drag to constrain the arc into a half circle.
1. Click and drag to create an Arc.
See Also
Editing Paths
Straightening Lines
Aligning Points and Segments Horizontally or Vertically
Aligning Points and Segments to an Angle
Spacing Points
Repeating Paths
Acquiring and Applying Length and Angle
Rounding Corners
Sharpening Corners
Converting Segment into a Curve
Converting Segment to Smooth Arc
Converting Segment to 3-Point Arc
Eliminating Extra Points
Removing One Point
Adding One Point
Removing Self-Intersections
Changing Starting Point
Separating to Closed Paths
Separating to Open Paths
Breaking Paths
Joining Paths
Converting Corners to Right Angle
Removing Tiny Objects
