MathDB

4

Part of 2019 Regional Olympiad of Mexico Southeast

Problems(1)

Prove two lines are parallel

Source: Mathematics Regional Olympiad of Mexico Southeast 2019 P4

10/23/2021
Let Γ\Gamma a circumference. TT a point in Γ\Gamma, PP and AA two points outside Γ\Gamma such that PTPT is tangent to Γ\Gamma and PA=PTPA=PT. Let CC a point in Γ(C≠T)\Gamma (C\neq T), ACAC and PCPC intersect again Γ\Gamma in DD and BB, respectively. ABAB intersect Γ\Gamma in EE. Prove that DEDE it´s parallel to APAP
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