Originally Posted by MadQuilter
I usually use the enlargement factor. Example: 4.5 divided into 5 = 1.11 and multiply all the other dimensions by that factor. ...and I thought High School Math would be useless in real life. HA! lol
The enlargement factor works well for the "finished" part of the block - but if one enlarges the entire thing, then the seam allowances get too big.
I use the pythagorean theorem a lot when trying to figure out triangle sizes. I also use graph paper a lot. Sometimes the graph paper is easier!