Rounding in a Drawing
Add a rounding to a corner formed by two straight lines, between two arcs, or between a line and and arc. You can select additional properties from the additional menu or define rounding properties in the dialog box.
- Select Drafting | Line Tools |  Round. Round.
- Click two lines which intersect each other.
- Select the additional rounding properties.  Additional Rounding Properties Additional Rounding Properties
- Select the lines as follows:- Select two straight lines.
- Select two arcs.
- Select a line and an arc.
 
- Define the rounding data in a dialog box.  Rounding Data Rounding Data
- Select OK.
Example:

Note: 
  - You can edit the rounding radius by selecting the Edit Round function.
- If the 2D Constraint Manager is enabled, the rounding involves a radius dimension, coincident constraints and tangent constraints.
- You can also edit the rounding using a dimension constraint. Note that this change will affect the radius dimension but not the lines between which the rounding was originally added.
