How do you Mitre a corner?
To create the mitred corner, we’re going to stitch along the press line that runs at a right-angle from the corner and down to the outer edge. Stitch along the press line, remembering to backstitch at the start and finish of your line of sewing. Snip off the corner, about 2mm from the stitched line.
What does it mean to miter a corner?
A mitre joint (often miter in American English) is a joint made by cutting each of two parts to be joined, across the main surface, usually at a 45° angle, to form a corner, usually a 90° angle. It is called beveling when the angled cut is done on the side, although the resulting joint is still a mitre joint.