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The Latus Rectum of the Parabola: (ax + by)2 + 2gx + 2fy + c = 0

Published online by Cambridge University Press:  31 October 2008

Robert J. T. Bell
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If a circle has double contact with a parabola, the points of contact being P and P′, its centre, G, is the point of intersection of the axis with the normals at P and P′, and the perpendicular from G to PP′ is the subnormal GN, which is half the latus rectum.

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