Fillet

Toolbar	Menu
Curve Tools Main Main2	Curve Fillet Curves

The Fillet command adds a tangent arc between two curves and trims or extends the curves to the arc.

Command-line options
Radius	Changes the fillet radius.
Join	Joins the resulting curves.
Trim	Trims the input curves to the resulting curve.
ExtendArcsBy	Applies when arcs are filleted or chamfered but need to be extended to meet the fillet curve or chamfer line. Arc The arc is extended maintaining its validity. Line The arc is extended with a line segment, which is joined to the arc converting it to a polycurve.

Toolbar	Menu
Curve Tools	Curve Fillet Corners

The FilletCorners command rounds the corners of polycurves and polylines with arcs of a single specified radius.

See also

Fillet, blend, or chamfer between curves and surfaces

Wikipedia: Tangent