Math Open Reference
Math Open Reference: Ellipses
Complete reference source for information on ellipses. Provides definitions and interactive activities that will enhance further explanation.
Math Is Fun
Math Is Fun: Ellipse
Students learn about the ellipse. The tutorial consists of notes, examples, and practice problems to check for comprehension.
National Council of Teachers of Mathematics
The Math Forum: Perimeter of an Oval
What seemingly ought to be straghtforward is not always the case. Dr. Math, in reply to a class question, points this out when discussing how to find the perimeter of an ellipse. Some links to websites that help with the computation are...