Conic Sections - Research Article from Macmillan Science Library: Mathematics

This encyclopedia article consists of approximately 2 pages of information about Conic Sections.
This section contains 525 words
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Foci

For every point on an ellipse, the sum of the distances from that point to two points called the foci is the same. These two points, the foci, are on the major (longest) axis of the ellipse. The value of this constant sum is 2a.

For every point on a hyperbola, the absolute value of the difference of the distances from that point to two points called the foci is the same. The absolute value of this constant difference is 2a.

See Also

Locus.

Bibliography

Jacobs, Harold R. Mathematics, A Human Endeavor. San Francisco: W.H. Freeman and Company, 1970.

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This section contains 525 words
(approx. 2 pages at 300 words per page)
Buy the Conic Sections Encyclopedia Article
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Macmillan Science Library: Mathematics
Conic Sections from Macmillan Science Library: Mathematics. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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