Activity
Math Words

Math words.com: Foci of an Ellipse

For Students 9th - 10th Standards
The definition for foci for an ellipse is given and the definition for ellipse is given. Also gives a diagram and the equation for an ellipse in standard form.
Activity
Discovery Education

Discovery Education: Web Math: Graphing Ellipses

For Students 9th - 10th Standards
WebMath offers a java applet that allows you to input information about an ellipse, in one of four forms, and gives you the graph of the ellipse.
Activity
Math Words

Math words.com: Ellipse

For Students 9th - 10th Standards
Brief definition for ellipse. The standard form for the equation of an ellipse is given also.
Handout
National Council of Teachers of Mathematics

The Math Forum: Analytic Geometry Formulas, Ellipses

For Students 9th - 10th Standards
A brief overview from the Math Forum on calculating various measures of segments, like major and minor axes and distance from focus to center, is given. Additionally, equations of ellipse in general and standard forms are listed.
Website
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Equations of Conics

For Students 9th - 10th Standards
Posed with a student question about equations of conics, Dr. Math provides some insight on the standard form of parabolas, ellipses, and hyperbolas. One example is shown.
Unit Plan
CK-12 Foundation

Ck 12: Analysis: Explicit Formulas

For Students 10th - 12th
[Free Registration/Login may be required to access all resource tools.] In this lesson students learn about explicit formulas for identifying terms of a sequence without knowing the preceding term. Students examine guided notes, review...