stitchinbee

I already have my quilt pattern drafted and have made my practice blocks, except for one. I need to construct an 8" (finished size) half quarter triange variation. I have included an image to illustrate what I am trying to do. I have a horrible tendency to overthink the simplist things, so I need your help. I would like any help in the form of an easy formula, or the measurements for this size block with accuracy or allowing myself to cut down when I square off. Please keep in mind though that I need to be on the conservative side of saving my fabric (usually I'm not). Thanks in advance.