Originally Posted by
GingerK
Okay, saw your last post. You have to take into consideration, that there is a seam line on the degree ruler and none on the protractor. Just try the paper method and mark the same degree as the ruler you have, then compare them.
Originally Posted by
Tartan
So now it makes sense as I forgot about the seam allowance, thanks GingerK
HI, Don't know if anyone still cares about this geometry stuff
The angle is the same for with & without seam allowance, but since quilters usually add it after, you were on the right track. The problem is you need to measure the angle from the APEX of the angle. That's where the 2 lines intersect. The ruler is cut off, so you would have to add it, by taping a piece of paper or something on to the ruler and extending the lines. Then the point would go in the middle of the protractor, and you would align the seam line with the base line on the protractor.
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