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Incyclic-Circumcyclic Quadrilaterals
Published online by Cambridge University Press: 03 November 2016
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1. Let α, β, γ, δ be parameters of four points A, B, C, D on the in-circle x2 + y2 = a2, the coordinates of A being (a cos α, a sin α) and so on. (Fig. 1).
The tangent at A is x cos α + y sin α - a = 0. The equation
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- Copyright © The Mathematical Association 1955