HST Block Size Cutting Question
I've been doing squares and rectangles for a long time, but I've always been a bit nervous about triangles. I'd like to make some HST blocks which will be 12" and 6" when finished. My method will be to cut out solid blocks, then use my rotary cutter and a ruler to cut them on the diagonal before sewing the various colors together to make the finished blocks.
Here's my questions for all of you pros out there.
1) What size should my beginning block be for the 12" block before cutting it?
2) What size should it be for the 6" block?
I've read about a lot of different techniques in my quilting magazines, and the simplest seems to be cutting solid-colored blocks in half with my rotary cutter, and mixing the triangles.
Can someone help me do this right, and not waste fabric?