To fillet/chamfer an interior point on a polyline:
Create a sketch Polyline with corners at (0, 0), (1, 0), and (.5, 1).
Press the Space bar or click Done.
Click thebutton and choose from the drop-down menu.
Click the point at (1, 0), and press Enter.
In the Edit Properties dialog box, set Radius to
0.2" and click .