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The foci of an ellipse are explored in this video. First, foci are shown as the two points on the major axis such that the sum of the distance from a point on the ellipse and the foci points is the same as the distance from any point on the ellipse, and that distance is 2a, where a is the length of the major axis. Next, the distance from the center to the foci along the major axis (a) is shown to be the square root of a2-b2. And finally, an example is shown where one needs to graph and find the coordinates of the foci given an equation of an ellipse.
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