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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
Extract
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.
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- Copyright © Edinburgh Mathematical Society 1932