In this video, Salman Khan of Khan Academy finds the foci of an ellipse.
Khan Academy
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Excellent site showing examples of algebra, trig, calculus, differential equations, and linear algebra.
Paul's Online Math Notes
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Article on ellipses. Above the level of most students, but useful for the tutor.
MathWorld
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A site with step by step tutorials on how to draw and graph a variety of mathematical functions
Analyze Math
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Online graphing calculator, useful for drawing out a function to visualize it or find key points.
http://www.coolmath.com
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A tutorial which includes a video and several examples for graphing ellipses and writing ellipses equations.
Algebra Lab
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In this video, Salman Khan of Khan Academy explains conic sections and ellipses.
Khan Academy
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A description of the axes of an ellipse and a formula for finding the length of the axes when given the foci.
Math Open Reference
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