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• 2007 IMO Problems/Problem 4
  ...math>\angle{ROP}=180-(A+C)=B</math>. Using law of sines on <math>\triangle{RPO}</math> we have: <math>\dfrac{RP}{\sin{B}}=\dfrac{OR}{\sin{(90+\dfrac{C}{2}
  8 KB (1,480 words) - 14:52, 5 August 2022