I love them dearly, but David and Phil are making you work too hard. Who wants to layout a billion trimmed circles to then make a billion arc segments? You’re having a hard day, your *$%# boss is making you figure out arc radii so that the *$%# contractor can actually build your *$%# boss’s *$%# elliptical wall. *$%#^ that. Use this tool instead.
Oh, it breaks in lots of situations . . . but what do you want for a free tool you lazy, lazy office drone.