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Thread: I think I need Math help???

  1. #1
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    Hi,
    I have a 17.5 inch star block. I would like to use it as the center square in a quilt. No pattern for this. I want to set it on point using HST's to form light/dark dianomds around the star block. Anyone know what size my HST's should be. There must be a formula to figure this out.
    TIA
    True4uca

  2. #2

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    I did a search engine for the formula you need for setting triangles and also corner triangles. You can find your formula here
    http://www.quiltbug.com/Articles/on-point.htm
    I hope this helps
    Peggy

  3. #3
    mlaceruby's Avatar
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    I think it would be 12 7/8 square cut on the diagonal

    a squared + b squared = c squared
    if c is 17.5
    then a and b would be 12 3/8
    plus 1/2" seam allowance on each end
    = 12 7/8

  4. #4
    mlaceruby's Avatar
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    hey ! I was right!!!
    thanks I bookmarked that site

  5. #5
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    is the 17.5 finished or unfinished block size?

    If 17.5 inch is the finished side length of the block, then

    The 12-3/8 inches for the finished short leg length of the block is right.

    The usual "formula" for cutting the squares for HST is finished size plus 7/8 inch.

    Then cut the squares 13-1/4 inches - need to allow that extra 3/8 inch for the points of the triangles.

  6. #6
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    Michele , what I want will be similar to your avatar pic. the star block is pre-printed panel (for pillow) it has two 1 inch borders printed after the star. I might cut those off if that will help get rid of that half inch. Just neasured it and it will always have the half inch.

  7. #7
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    Just visited the site Peggy listed. I think I've figured it out. I'll make the end (points) a little bigger. Opps that won't work.

  8. #8
    mlaceruby's Avatar
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    that site agrees with the 12 7/8 that I came up with.
    your block measures 17.5 but after sewing will finish 17
    so the chart says 17 finished cut the square 12 7/8"
    then cut on the diagonal
    trust me!

  9. #9
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    Quote Originally Posted by mlaceruby
    that site agrees with the 12 7/8 that I came up with.
    your block measures 17.5 but after sewing will finish 17
    so the chart says 17 finished cut the square 12 7/8"
    then cut on the diagonal
    trust me!
    IF the finished size is 17 inches, your number for the square size is correct.

  10. #10
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    I'm back ,had to visit local A/C dinner, it is hot. Ok I'm willing to take a leap of faith, really don't understand 12 7/8 square. I'm thinking 3-4 inch HST's to circle (diamond) my 17.5 inch block. I'm thinking 12 7/8 for the corner after I finish my HST's. I'm trying to figure out how big my HST's should be. I'm thinking each round of HST's might need to be bigger

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