I'm not asking how to solve what a corner radius is on a piece, rather how to calculate what corner radius I should use on a piece.
I need to make a (negative) template to follow with my router. In order to do so, I need to use a hole saw to drill out a curved corner. I'm having trouble calculating what the corner radius would be such that I can determine what size hole saw to use.
The picture probably explains better than my words, but essentially I want to round off the corners of a rectangle with the curve starting 3/4" away from the corner. I don't know if this is more math but it's something I've run into previously while woodworking.
How would I determine both the size of the hole saw to use as well as the distance I should center it from the corner (r)?