Originally Posted by
tapper
Excellent article.
As far as I can determine, the tools mentioned will only work for rectangles that finish to a 1:2 ratio - that is 1x2, 2x4, 4x8, etc. (the angles with that are approximately: 63.43, 90, and 26.56 degrees)
Your 10 x 16 rectangle is certainly doable. I would draw the 10 x 16 rectangle on whatever it will fit on - divide it diagonally - paste the pieces on heavy paper (or template plastic, if one can get it large enough) - and then add 1/4 inch seam allowances to that.
For a right triangle with 10 and 16 inch legs, the angles will be approximately: 32, 90, and 58 degrees.
A 30,60,90 degree ruler will give a ratio of height of 1.73 (square root of 3, to be exact) to 1
A 45, 45, 90 degree ruler will give a ratio of height of 1 to a width of 1
A Tri Rec ruler will give a ratio of height of 2 to a width of 1