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Thread: could someone calculate for me please

  1. #1
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    I have a center for round robin i want to put on point. The center is 21.5 square and i need to know what size square to cut in half for each side. Thanks

  2. #2
    mim
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    let's see -- you will want to cut half square triangles so the outer sides will be straight -- not on the bias. Measure the side of your square.

    The distance across the half square triangle will be that distance plus a little to allow for wiggle room and squareing up. As an example, -- if you needed an 8 " diagonal -- the original square is 6". To make sure, you might like to make a paper "half square triangle" to exact size and use it as a pattern. Newspapers are great for this.

    I hope this is helpful.
    Mim

  3. #3
    MTS
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    21" FINISHED divided by 1.414 = 14.85" + .5" seam allowance.

    Rounded up to 15.5" CUT size.

    But I'd cut them bigger (16.5+) to have the center float - gives you more wiggle room.

    Double check it the other way to find the diagonal of a square:
    15.5" square - .5" seam allowance = 15" FINISHED x 1.414 = 21.21"

    Close enough. ;-)

  4. #4
    Moderator QuiltnNan's Avatar
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    Quote Originally Posted by MTS
    21" FINISHED divided by 1.414 = 14.85" + .5" seam allowance.

    Rounded up to 15.5" CUT size.

    But I'd cut them bigger (16.5+) to have the center float - gives you more wiggle room.

    Double check it the other way to find the diagonal of a square:
    15.5" square - .5" seam allowance = 15" FINISHED x 1.414 = 21.21"

    Close enough. ;-)
    wow, you're the math wiz here

    :thumbup:

  5. #5
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    Wow thank you so much

  6. #6
    Super Member ckcowl's Avatar
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    to find the triangle size to put any square on point- divide the size of the block by 1.414 add seam allowance- round up to nearest whole inch (or half if you want) cut in half you have 2 of your setting triangles- to know how big your square will be when placed on point multiply the size of the block by 1.414- that gives you the size of the on point block- it also gives you the dimension of the diagonal of your original block....1.414 os a number that comes in handy ALOT! you will either multiply or divide with it lots.

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