Need help from a math wizzard!
 

I want to set my quilt on point. I know how to do that and know how to figure the setting [ATTACH=CONFIG]557166[/ATTACH]triangles. What I don't know is how to figure the size of the finished quilt. If I use 12" finished blocks and use 13 blocks, what size will the quilt be before I add borders? I sketched out what I want and when its sewn together with the setting triangles and hung straight, it will be 3 blocks across x 3 down. So do I just take the diagonal measurement of the block times 3? So for 12" blocks the diagonal measurement is 17", so 17 x 3= 51" square? Or 10" blocks would measure 14 1/8 diag. so 14 1/8 x 3 =42 3/8 before borders? This is a special quilt and I really don't want to screw it up. I do not want anything larger than a lap quilt. HELP PLEASE ! Thanks. Jan

Each side is 51" in length. it is a square quilt so it is 204 " all the way around. I got an engineering degree...that counts as a math wiz...lol

You are correct. Measure the diagonal of each square to get the length and width of your quilt. Don't forget to allow for your seam allowance.

Just Jan - you were figuring correctly

That is why I love EQ7! The program does it automatically.

Well this is interesting. I drew it up in EQ, 12" blocks. Ends up being 50.912" square. That's a difference of 8 inches between the "math whizzes" and EQ. Well, some of the math whizzes. :D

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That definitely counts as a math wiz. I'm married to an engineering type who is a math wiz. He's very useful when I can't remember the formula to get a certain measurement ;)

Jane said 51"

51.000 - 50.912 = 00.088. That is less than 1/10 of an inch difference.