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

  1. #1
    Super Member joyce888's Avatar
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    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?
    Joyce

  2. #2
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    I hope this will help you.

    http://quiltville.com/onpointmath.shtml
    ranger
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  3. #3
    Super Member joyce888's Avatar
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    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
    Joyce

  4. #4
    Super Member charsuewilson's Avatar
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    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. #5
    Power Poster QuiltE's Avatar
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    Quote Originally Posted by joyce888 View Post
    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.
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  6. #6
    Power Poster nativetexan's Avatar
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    sorry, had the wrong link.

  7. #7
    Super Member Jan in VA's Avatar
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    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
    Jan in VA
    Living in the foothills
    peacefully colors my world.

  8. #8
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    Quote Originally Posted by Jan in VA View Post
    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. #9
    Senior Member quiltin-nannie's Avatar
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    Quote Originally Posted by Jan in VA View Post
    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.
    Julie
    Good friends are like stars; you don't always see them, but you know they're always there!

  10. #10
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    Added link to my favorites. Thanks!

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