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One of the two points that can be used to define an ellipse. For every point on an ellipse, the distance from the point to one focus, plus the distance from the point to the other focus, is equal to some constant value. Another name for a focus is a focal point. The plural of focus is foci. 'c' units from the center. c^2=a^2 - b^2.

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1. One of the two points that can be used to define an ellipse. For every point on an ellipse, the distance from the point to one focus, plus the distance from the point to the other focus, is equal to some constant value. Another name for a focus is a focal point. The plural of focus is foci. 'c' units from the center. c^2=a^2 - b^2.





 
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