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# Math for half square triangles

12-28-2009, 07:35 AM
#1
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Join Date: Apr 2009
Location: Ayr, Ontario
Posts: 1,059

I want to make an applique wallhanging featured in the current issue of Quilter's Newsletter. It uses 184 half square triangles cut by hand but I want to use the Fons and Porter ruler so I don't have to sew all those bias edges. My question is: the block size is supposed to be 2 3/8": what size do I cut my blocks to use the Fons and Porter ruler? Is it an extra 7/8"? That would make my cuts at 3 1/4"? Thanks in advance for the help.
12-28-2009, 07:39 AM
#2
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Join Date: Aug 2009
Location: The middle of an IL cornfield
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I do HST by adding 1 inch to the finished block size. Draw a diagonal line and then sew 1/4 inch from each side of the line. Cut along the line and then square up as needed.

Many sites say to add 7/8 inch but I hate working with odd measurements so I just add 1 inch.
12-28-2009, 02:02 PM
#3
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Location: middle of a farmer field
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To do HST you do add the 7/8 for an accurate measure, and so it is 3 1/4 in.

I don't have a fons and porter ruler so can't help you with that part.

but these measurements will give you a 2 3/8th's block. I wold test it out on one or two blocks to make sure that they come out the size that you would like,
12-28-2009, 02:55 PM
#4
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Location: Ayr, Ontario
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Thanks for the help, I knew I would find the right help here. Wish me luck with the challenging quilt.
12-28-2009, 02:55 PM
#5
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Good Luck!!!!!!!!!
12-29-2009, 11:53 AM
#6
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Originally Posted by quilter1
I want to make an applique wallhanging featured in the current issue of Quilter's Newsletter. It uses 184 half square triangles cut by hand but I want to use the Fons and Porter ruler so I don't have to sew all those bias edges. My question is: the block size is supposed to be 2 3/8": what size do I cut my blocks to use the Fons and Porter ruler? Is it an extra 7/8"? That would make my cuts at 3 1/4"? Thanks in advance for the help.
That is an odd size for a block... I haven't seen that size for a block before. That would make the cutting a nightmare for me :oops:
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