A guy I work with was building a shed and needed help figuring out what measurement to use for a board. He sketched out his problem on paper. When I came up with a number for the length of board he needed he said.... "how did you figure that out?" not believing it was the right length. I told him I was a quilter and it looked like the edge of a quilt with blocks set on point. What he needed was the length of a "set in triangle".... I was right too...:v)