Rounds corners (vertices) in a sketch by placing an arc of a specified radius at the corner or intersection of two lines. The fillet arc is tangent to the curves trimmed or extended by the fillet.
Access
Ribbon:
Sketch tab
Draw panel
Fillet
Create multiple fillets in a single command; all have the radius specified for the first fillet created.
Create fillets on perpendicular or parallel lines, concentric arcs, intersecting and nonintersecting arcs, elliptical arcs, splines, or between arcs and lines.