olymmath

HMMT 2021 T9

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Let scalene triangle ABCA B C have circumcenter OO and incenter II. Its incircle ω\omega is tangent to sides BC,CAB C, C A, and ABA B at D,ED, E, and FF, respectively. Let PP be the foot of the altitude from DD to EFE F, and let line DPD P intersect ω\omega again at Q≠DQ \neq D. The line OIO I intersects the altitude from AA to BCB C at TT. Given that OI∥BCO I \| B C, show that PQ=PTP Q=P T.

Dataset text NuminaMath olympiads. Quoted with source.

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