MathDB
Midline and tangent related geo, equal angles wanted

Source: IMOC 2021 G2

August 11, 2021
geometrycircumcircle

Problem Statement

Let the midline of ABC\triangle ABC parallel to BCBC intersect the circumcircle Γ\Gamma of ABC\triangle ABC at PP, QQ, and the tangent of Γ\Gamma at AA intersects BCBC at TT. Show that BTQ=PTA\measuredangle BTQ = \measuredangle PTA.