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Tuesday Tutorial~ On Point

I really like to put quilts on point. The look really appeals to me. I like the look so much that when we tiled our home I had them put it on point. 

Mary’s Garden

 It does involve a little math though. This math is based on the Pythagorean theorem. Which when I was in school I thought I would never use and thus did not pay much attention to. Not until helping my oldest with his math did I find the true value of this great theorem.


 It states that squaring the two legs of a triangle and adding them together equals the hypotenuse squared. In other words  a2 + b2 = c2

Mountain Retreat

 When setting a quilt on point your legs are the same. 2a² =c²  round up to the nearest measurement on your ruler. Then add 1″ for seam allowance. Cut a square this size and cut on diagonal twice. This will give you your setting triangles. Example if your block finishes at 6″. 2×6²= c²  If you do the math you will get √72. This equals 8.49. Round to 9 and add your 1 3/4″. Which gives you 10 3/4″. Cut an 10 3/4″ square and cut it on diagonal twice.


 For your corners you go in reverse as the hypotenuse is our known number and we are trying to find our legs. c² = 2a². Using the same 6 would be c. So 6²= 2a². Which gives us 36 that we then divide by 2 giving us √18. Which equals 4.24. Round to 4.25 and add 1″ for seam allowance. So cut a 5 1/4″ square cut on diagonal once.


 I understand that for some of you math may not be your strong point. No worries. Bonnie Hunter has a chart that gives sizes of blocks along with setting and corner triangles here. Sorry if I confused you with all the math but I like to know why and how things work and thought there might be a few of you out there that would too.

Mountain Blossoms

 Just a heads up next week we will have a link up and giveaway.  If you have used a tutorial you have found here be prepared to link up and win a chance for your choice of one of my patterns in pdf format.


  • Karen - Quilts...etc. says:

    math is not my strong suit – I hate – I love quilts on point though and I just do it my own way! I didn't know Bonnie H had a chart though so next time I might check it out.

  • Loris says:

    I'd say that is "Fun with Math". Interesting and useful 🙂 Thanks for explaining that!

  • Needled Mom says:

    Another reason we should love our math classes!!!! I love quilts on point.

  • Janice Holton says:

    This is great information! But you lost me at round to 9 and add 1 3/4". Why are we adding 1 1 3/4? Earlier in the tutorial you said add 1" for seam allowance so where did the 1 3/4" come from? I am confused!

  • Shepherdess55 says:

    Ditto Janice's comments. Additionally, when you add the two numbers together it equals 10 3/4" not 11 3/4".

  • Cathy says:

    The part I can never figure out is HOW MANY blocks I would need to set a quilt on point to get the desired size of quilt.

  • Linda @ kokaquilts says:

    Maths has never been my strong point, but I enjoyed reading this! I tend to lay everything out on my 'design floor' and workout the setting triangles from there! I cut them all a bit larger to ensure I've got it covered!

  • Janie says:

    Fun with math and quilts, I love it!

  • em's scrapbag says:

    The 1 3/4" is for the setting triangles and the 1" is for the corner triangles. Let me know if you have further questions.

  • em's scrapbag says:

    Your right sorry for the math error. I've fixed it. Thanks! Also the 1 3/4" is for setting triangles and 1" is for corner triangles. Sorry that was confusing.

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