Joining binding strips
I can't believe I'm asking a math question, but here goes. When determining how many binding strips to cut, how do you calculate how much will be needed for the diagonal joins? I needed 320" of binding, which is about 8 strips. I cut nine to allow for the 8 joins. I only used about 6" of the ninth strip. My mind says that a diagonal join should use more. Do you only need about 1/2"? It's not important, but I don't like being confused.