williamskay wrote:
Can someone explain the math for adding half square triangles to our unfinished 6.5 blocks? I want to understand how Alex came up with 5 and 1/4 inches for the square to be cut diagonally.
HST Math:
Finished size of the block + .875 cut in half once on the diagonal—short side is straight of grain.
QST Math:
Finished size you need + 1.25”, cut in half twice on both diagonals—long side is straight of grain
More Quilters Math:
Here is how Alex calculated the 5.125 square she mentioned—she DREW it on paper actual size to see what size QST fit her 6” blocks. I use a calculator.
To figure out what size HST fits a 6” block, when you want the SHORT side to be straight of grain. This is ONLY for the OUTER triangles Alex wants on the outside edge of her quilt:
Divide 6”/1.4142 = 4.24268137... 4.25 is as close as you can get
Add .875” (7/8”) 4.25 + .875= 5.125” These 5.125” squares are cut in half ONCE on the diagonal.
All of the INTERIOR triangles on Alex’s quilt are QST so the LONG side is straight of grain, are cut 7.25”. 6+1.25=7.25
It is past time for me to write my QUILTERS MATH post, I will get on that today.