How is tempered glass cut?

It is cut before it is tempered. If you attempt to cut tempered glass it will shatter. He is exactly right, before it is tempered, it's called annealed. Tempering is achieved by heating the glass and a rappid air cooling. This causes a great deal of stress on the glass. Any attempt to cut, drill, or edge it, and it will explode.

well this is a completely crazy way to do it but you can take a piece of tempered glass about 5000 ft below see and cut it but like obviously it would be cheaper to just buy a new piece or if needed you can un-temper glass from what i here not sure though