How much do I need? Math/Triangle Help needed

According to my calculations... I think you need to cut a square approximately

9" (I might even go 91/2 and trim a bit to be sure). You need to cut it diagonally -- creating half square triangles.

I calculated it use the a-squared + b-squared = c-squared (leg... leg... hypotenuse) measurement. That old geometry was good for something.

Doing it this way puts the bias edge along your existing square -- keeping the straight of grain on the outside of your new square.

I hope somebody will correct me if I'm wrong!

Kate in MI

Oops!! My measurements FORGOT to add the seam allowances... so be sure to add

1/4" on all sides... thus taking it up to about 10 or 10 1/2 " (or even 11 -- I would rather throw a sliver away then end up a sliver short!)

Kate in MI

approximately 9" (I might even

creating half square

hypotenuse) measurement.

straight of grain

Hi, I just faced exactly the same issue -- needed to add the corners to make my center diamond on point in the middle of a bigger square. Anyhow, I wrestled with it and made a mess and then Googled and found Victoriana Quilt Designs

and discovered that they had all "quilty formulas" in the world just waiting. It's really a good site and the measures they gave seem to work. At least they did for me.

Sunny

Howdy!

10 yards.

Oh, wait, that's my standard answer for "how much fabric do I need?"

For the square-in-a-square or on point equation, here's a formula (your computer's got a calculator, right?):

Here's another lesson on cutting those set-in or corner triangles:

Will that do for now? HTH

I don't know why you scoff, Tricia. If *you* say that piecing was perfect, *I* won't argue. ;-P

Good luck, w/ the triangles and the job interview!

Ragmop/Sandy --who also cuts large and trims down on those triangles

Okay, thanks to the QuiltingPassion.Com tutorial (which, despite being a math ed minor, made more sense to me than using the pythagorian theorem -- it's the adding in the seam allowances that get me), I have figured out that I need 9.5 in squares -- however, knowing my measuring/cutting ability, I'm gonna aim for 10.5 in squares and trim away.

If my figuring is correct then, 1/3 yd of standard off the bolt material should give me more than enough fabric to make the 2 10.5 in squares or am I off somewhere???

Thanks Sandy, Kate, and Sunny for giving me numbers, links, and a boot in the bottom *snicker* (and well wishes as well, they are appreciated).

Tricia

Sandy Ellis> Howdy!

How much to buy? As much as you can afford, especiall if you Really love the fabric. For calculating your corner triangles, clear off the cutting mat. Measure off 12" (or however big your block is) on the diagonal line of the mat, move up to the next vertical line that crosses the diagonal, run your finger down to the base line where the numbers are, and that's your square. Add another inch to allow for seam allowances. Cut 2 squares for each block, and cut them in half diagonally for your 4 corners. (If your original blocks vary in size, here's your chance to make them all even. Cut the triangles even larger, then trim all the finished blocks to the same size.)

Good luck with the interview! Roberta in D

"Tricia" schrieb im Newsbeitrag news: snipped-for-privacy@h48g2000cwc.googlegroups.com...

Thanks Roberta --

I can't picture how to do that at the moment (I'm at DH's office at campus not home where my stuff is) but I'll check it out when I get home.

Thanks for the good wishes -- I got a job....

Tricia =)

Roberta Zollner wrote:

I used to automaticly use the pythagorean therom to figure out 90 degree corner blocks. Then one day I remembered I could draw the things out on graph paper. DUH!

NightMist often thinks too much

If you know how long you want the long side, divide by 1.4 to get the finished size of the short sides. Then add your seam allowance; I usually figure at least one inch to get the size of the square you need to cut in half for your triangles. In your case, your square should be

12/1.4=8.6. Then add an inch and round up (you can always trim it down) and you get 10 inches.

For setting triangles, you want the long side to be on the straight grain, so the short side of the triangle has to be the same length as your block size. The easiest way to cut these is to cut a large square and cut it diagonally in both directions to get 4 triangles from a square. To determine the size of the square, multiply the length of the short side by 1.4 and add seam allowance (at least 1.25 inches). If you are using 12" blocks, this works out to 12x1.4=16.8; add 1.25 and round up and you get 18.5" squares.

I came up with 1.4 using the Pythagorean theorem, A squared plus B squared = C squared. Assume a triangle with 1" short sides, so A & B each equal 1. Squaring 1 gives 1, so you end up with C-squared = 2. C then is the square root of 2, approximately 1.4.

Julia > alright Raggy, here's the stash question I promised *snicker*

You forgot the seam allowances...... I would go with 2 squares, at least 10" cut on the diagonal. (you add 7/8" to the finished size of the triangle to get the size of square to cut.......And I always add extra. So actually I would probably use 10 1/2" squares.... )

Pati,> According to my calculations... I think you need to cut a square

approximately 9" (I might even go

half square triangles.

hypotenuse) measurement.

straight of grain on