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The Polar Equation of the Tangent and Normal to a Conic
Published online by Cambridge University Press: 31 October 2008
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The property of a conic: “if the projections of K, any point on a tangent, on the directrix and the focal radius of the point of contact be I and U respectively, SU = e. KI,” is known as Adams's Property. The statement of the above property in terms of the polar coordinates of K is the equation of the tangent. Hence, if the eccentric angle of the point of contact is a
or 
= cos (θ — α) + e cos θ is the equation of the tangent.
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- Research Article
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- Copyright © Edinburgh Mathematical Society 1932
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