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Activity
Math words.com: Foci of an Ellipse 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.
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Graphic
Kepler and Ellipses Graphic
Other

Kepler and Ellipses

For Students 9th - 10th
Good site explaining the laws of planetary motion and ellipses
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