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  • ...ngle ACB_1 = \angle DCB + \angle BCA + \angle ACD = 180^\circ,</cmath> so points <math>A_1, C,</math> and <math>B_1</math> are collinear. Similarly, triples of points <math>A_1, B, C_1</math> and <math>B_1, A, C_1</math> are collinear.
    19 KB (3,355 words) - 07:00, 22 August 2024