Perimeter of an OvalDate: 04/08/99 at 11:11:08 From: Mrs.Suprin's Class Subject: The name for the perimeter of an oval We wanted to know what the name for the perimeter of an oval is. We lookeed in a high school geometry book and found no answer. Please help us if you can. Thanks, Mrs. Suprin's Fifth Grade Class Date: 04/08/99 at 12:40:14 From: Doctor Peterson Subject: Re: The name for the perimeter of an oval Hi, Class! The shape you are talking about is probably an ellipse, which looks like an elongated circle: ***************** ****** ****** *** *** *** *** * * * * * * * * *** *** *** *** ****** ****** ***************** If you just want the name of this shape, "ellipse" is the answer. If you really mean a name for the perimeter, that is, the length of the curve, then not only can't I give you a name for it, I can't even tell you how to calculate it! This is one of those problems that mathematicians have found can't be solved using normal things like addition and multiplication, so they just defined new things called elliptic integrals. On our FAQ page we give only an approximation: http://mathforum.org/dr.math/faq/formulas/faq.ellipse.html There's another formula here: Formula for the Circumference of an Ellipse http://mathforum.org/library/drmath/view/54847.html If you want to learn more about ellipses, search the Dr. Math archives for the words "ellipse" or "conic section". Have fun! - Doctor Peterson, The Math Forum http://mathforum.org/dr.math/ |
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