Draw an arc tangent to a curve

1. Choose Keypoint Curve Tools > Arcs > Arc Tangent to Curve.
   
2. Click the start point of the new arc on the curve it will be tangent to.
   
3. Click the end point of the arc.

Draw an arc concentric to another arc

1. Choose Keypoint Curve Tools > Arcs > Concentric Arc.
2. Click the arc from which the new arc will be offset.
   
3. Click the start point and end points of the arc.

What if...?

• I want to create a concentric arc of more than 180 degrees?

  Concentric arcs are usually drawn in the direction that will create the smallest sweep angle.

  To draw an arc in the opposite direction, choose Windows > Information > Information Window. Open the Attributes section and click Complement.

• I want to create a concentric circle?

  Choose Windows > Information > Information Window. Set the Angle/Sweep attribute to 360.