Square Fillet Corners in AutoCAD

The AutoCAD Fillet command can be used for adding Fillets at a chosen Radius, however it can also be used to add Square corners. To do this you can change the Radius to 0, or usefully hold the Shift Key whilst selecting the relevant lines you want the Square corner between.

This saves you the effort of changing the Radius value to create a Square (or 0 Radius) corner, leaving the preset Radius value as you like it.

A useful tool for joining lines together, making sure they have complete, closed boundaries for Hatching etc.