bearisgray

The angles used in the Tri-Recs tools are:

90, and approximately 63.435, and 26.565 degrees for the skinny triangle,
and

approximately 63.435, 63.435, and 53.130 degrees for the "center' triangle.

If one does not have one of the Tri-Recs types of rulers, it is quite easy to draft one's own template for the unit.
Post #13 gives an example of what one would look like.

maviskw

Gay: post #15, has the correct way to sew two rectangles together to get a half rectangle triangle. Is that an HRT?

If you cut the rectangle in half on the bias, that will work also, but then you are sewing on the bias.

ghostrider

RE: post #15 diagram

Just make sure your A and B rectangles are oversized enough to get the correct size on your A/B HRT after you cut on that center line and 'rectangle up' the resulting HRT. A half inch isn't enough.

sewwhat85

This will not work "I may be wrong but I would take 2 rectangles 4 1/2x 3 1/2 then sew and cut as you would a HST. Anxious to see how wrong I might be but that's how I would do it."

LTeachergeorge

I remember struggling with this a while back when doing a BOM. If memory serves me correctly, I finally paper pieced the rectangles to get them to turn out the right way (and the right size). Good luck with your effort!

Linda in Missouri