Fillet corners
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                                                        Home tab > Modify group > Fillet, FILLET | 
Fillet the corner of two lines or arcs or the corners of a polyline.
Do the following:
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If you want to change the radius of the fillet, do the following:
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On the command line, enter Radius.
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Enter the radius.
 
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If you want to change the trimming of the fillet, do the following:
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Enter Trim.
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If you want to connect the fillet to the lines, enter Yes.
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If you want to keep the original corner visible, enter No.
 
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If you want to fillet all the corners of a polyline, do the following:
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Enter Polyline.
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Select the polyline whose corners you want to fillet.
 
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If you want to fillet the corners between two lines or arcs, do the following:
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Select the line or arc that you want to fillet. If the lines or arcs cross each other, select the object on the side that you want to keep.
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Select the other line or arc. If the lines or arcs cross each other, select the object on the side that you want to keep.
 
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The program extends the lines if necessary and connects them with a fillet according to your definitions.
Remove a fillet
Do the following:
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Select Edit > Erase.
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Select the arc that you want to remove that connects the objects.
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If you want to, you can extend the lines by stretching them or selecting Edit > Join > Join corner and selecting the objects.
 
If you want to remove one or more fillets from a polyline, enter 0 as the radius and fillet the corners of the polyline again according to the instructions above.