
doi: 10.2307/3609969
1. Let α, β, γ, δ be parameters of four points A, B, C, D on the in-circle x 2 + y 2 = a 2 , 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
elementary geometry
elementary geometry
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