Hmph. Well, I confess I can't whip out the geometry from memory. I know exactly what to Google to find the formula, but... I haven't had to use that part of my brain recently. Probably time to start sewing again.
I have to laugh. This is like hearing from Aunt Edna that your cousin is gay. (It's a sort of muffled 'well duh, who didn't know, and who cares?' laugh that may be disguised as a cough.)
So do you hate cousin Soandso now, Aunt Edna? Then why is this news? Unless he's planning to settle down, what do I care who he's got in his bedroom? And if he is planning to tie the knot, then I need to find a gift. The point is? Is this just gossip or is this somehow my concern?