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A Problem in Confocals

Published online by Cambridge University Press:  31 October 2008

Robert J. T. Bell
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In the standard text books on Analytical Geometry the following problem occurs in the exercises on confocals:

The product of the four normals from a point P to the ellipseX2/a2 + Y2/b2 = 1 is equal to where λ1 and λ2 are the parameters of the confocals through P.

Type
Research Article
Information
Edinburgh Mathematical Notes , Volume 27 , January 1932 , pp. vi - vii
Copyright
Copyright © Edinburgh Mathematical Society 1932