Read these:
Perimeter of Ellipse
Math Forum: Ask Dr. Math FAQ: Circumference of an Ellipse
But given what you've said, maybe the best way is to use a piece of string.
Read these:
Perimeter of Ellipse
Math Forum: Ask Dr. Math FAQ: Circumference of an Ellipse
But given what you've said, maybe the best way is to use a piece of string.
A good approximation is Ramanujan's:
or better approximation:
aidan, i'm sorry but i just copy pasted it(sketch) directly from the NET . . . . i don't even try using the LATEX yet, much more with software programs that plot or draw. . . . i make good use of the NET, where young students don't bother to check, i'm just trying to be helpful to them . . . .