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• 2004 Indonesia MO Problems/Problem 4
  ...The sum of the angles in a line is <math>180^\circ,</math> so <math>\angle ZWX = \tfrac{w+x}{2}</math> degrees and <math>\angle ZYX = \tfrac{y+z}{2}</math .../math> is a quadrilateral, <math>w+x+y+z=360^\circ,</math> so <math>\angle ZWX + \angle ZYX = \tfrac{360}{2} = 180^\circ.</math> Thus, all the tangent po
  2 KB (343 words) - 11:02, 5 August 2018