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# Thread: Question - What size to cut squaring-up triangles

1. ## Question - What size to cut squaring-up triangles

I've got 12 1/2" unfinished blocks that I'm setting on point, then want to add the triangles to make them square. To avoid having bias edges on the corners, would I cut them at 12 1/2" with one diagonal cut?

http://quiltville.com/onpointmath.shtml

3. Thanks Ranger. I guess I wasn't trusting my math skills today (I was coming up with the right answer just didn't KNOW it was right). That's what happens when you try to do math with a headache. LOL

4. The quiltville site doesn't explain where the 1.41 factor comes from. If you have a 1" square, and cut it into a triangle, the length of the diagonal is calculated from the square of the sides, so 1 squared + 1 squared = 2. 2 is the squared length of the diagonal side (hypotenuse), so you have to take the square root to get the length, and the square root of 2 is 1.41 .

Changing the length of the sides, the 1.41 becomes the factor to multiply by the length of the sides.

5. Originally Posted by joyce888
Thanks Ranger. I guess I wasn't trusting my math skills today (I was coming up with the right answer just didn't KNOW it was right). That's what happens when you try to do math with a headache. LOL
If you are hesitant ... cut them a little larger. That;'s what I always do, and then trim after the quilt top is fully assembled.

7. SIDE SETTING TRIANGLES:
1. Measure your block ON THE DIAGONAL and add 2" to that measurement and cut a square.
2. Cut that square on BOTH DIAGONALS. The long edge will be on the straight grain and will be set along the EDGES of your quilt top.

CORNER SETTING TRIANGLES:
1. Measure your block along one side, add 2" to this measurement and cut 2 squares.
2. Cut these squares on ONE DIAGONAL. The short sides will be on the straight grain and will be set along the corners of your quilt top.

No math. No lost block points. A little "float" allowed. A stable, wonderful setting!

Jan in VA

8. Originally Posted by Jan in VA
SIDE SETTING TRIANGLES:
1. Measure your block ON THE DIAGONAL and add 2" to that measurement and cut a square.
2. Cut that square on BOTH DIAGONALS. The long edge will be on the straight grain and will be set along the EDGES of your quilt top.

CORNER SETTING TRIANGLES:
1. Measure your block along one side, add 2" to this measurement and cut 2 squares.
2. Cut these squares on ONE DIAGONAL. The short sides will be on the straight grain and will be set along the corners of your quilt top.

No math. No lost block points. A little "float" allowed. A stable, wonderful setting!

Jan in VA
Thank you for this! I am planning a quilt with blocks set on point and was wondering the same thing. This method sounds so easy! I'm going to try it and see how I like it.

9. Originally Posted by Jan in VA
SIDE SETTING TRIANGLES:
1. Measure your block ON THE DIAGONAL and add 2" to that measurement and cut a square.
2. Cut that square on BOTH DIAGONALS. The long edge will be on the straight grain uhand will be set along the EDGES of your quilt top.

CORNER SETTING TRIANGLES:
1. Measure your block along one side, add 2" to this measurement and cut 2 squares.
2. Cut these squares on ONE DIAGONAL. The short sides will be on the straight grain and will be set along the corners of your quilt top.

No math. No lost block points. A little "float" allowed. A stable, wonderful setting!

Jan in VA
Jan, I've been quilting many years but have only been on QB for a couple months. I have really enjoyed reading your posts, and have even learned some new things from you. Just wanted to say thanks for the wonderful things you share. Even us old dogs can learn a new trick or two.