FILLET allows you to create a fillet by choosing from 
the following options:


ARC - to create a tangent arc with a specified radius,
between two selected entities. If desired, the selected
entities can be trimmed or extended to the intersections 
with the arc fillet.

CHAMFER - to create an angled line with its endpoints on 
two selected lines, at specified distances from the
intersection (or potential intersection) of the lines. 
The selected lines are trimmed or extended to the
intersections with the chamfer line.
