I am a field service engineer and the most math I need to know is to make sure there are not too many nodes connected to an access point. My girlfriend is working on her masters in physics. She thinks we need to take an interest in each others hobbies Ok mine is saltwater reef aquariums, hers is mathematics. She enjoys it so much she even volunteers her time to teach at an adult education center. Now onto my problem; She came up with a math problem and asked me how I would solve it. You bought a old circular table and the top there was only less than half left. How do you figure out the exact diameter of what the table was. Ok what little I do remember from high school I know that a perpendicular bisector will pass thru the radius of a circle. Thinking I am smart for once I said I would draw two bisectors and at the point of intersection I could measure that and multiply by 2 this would give me the diameter. That was not the answer she wanted she wants to know how this could be solved using only a tape measure and math. After some time I gave up and she told me that I could use A squared + B squared = C squared Pathagareum (SPL) theory. I have looked this over several times and I see no right angles. Is she correct or did she for once make a mistake and there is another way? Probably not but If she is correct perhaps someone can explain it..

Thanks in advance

Mark