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 Lesson Plans (1) Interactives/Games (2)

## ALEX Lesson Plans

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Subject: Mathematics (9 - 12), or Science (9 - 12)
Title: Ellipse
Description: This lesson is designed for an Algebra II through Pre-Calculus classes and introduces the conic section- an ellipse. In this lesson students explore an ellipse, the set of points in a plane such that the sum of the distances from each point to two fixed points is constant. The students will investigate the construction of an ellipse and be able to recognize its major axis, semi-major axis and focal points and to be able to compute its eccentricity. This lesson plan was created as a result of the Girls Engaged in Math and Science, GEMS Project funded by the Malone Family Foundation.

## Web Resources

### Interactives/Games

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Interactive Graph of an Ellipse
https://www.desmos.c...
This is an interactive graph of an ellipse. Features include sliders which can be moved to change the coordinates of the foci to explore changes in eccentricity and the lengths of major and minor axes.

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Graph of a Hyperbola (Conic Section)
http://www.desmos.co...
This is an interactive graph of a hyperbola. The foci and center of the hyperbola are shown on the graph. Moveable sliders allow the coordinates of the foci to be changed to explore changes in the graph.