the point of the end would have to be at a 90 degree angle. if you think of how all triangules's angles add up to 180 degrees , and that the other to angles would have to be equal, then you can find out the other to angles to be at 45 degrees. I hope i helped
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Scribe and cut to the line.
There are mathematical methods, but they depend on what you want the ends to look like.
draw the frame in precise proportions scaled down on paper
cut the x from paper and match on drawing
draw then on the same drawing with the frame
measure angles in drawing