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Incyclic-Circumcyclic Quadrilaterals

Published online by Cambridge University Press:  03 November 2016

Extract

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

Type
Research Article
Copyright
Copyright © The Mathematical Association 1955

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