106 Geometry Problems [upd] Access

If stuck for 20 min, switch to coordinates/complex numbers (but only if allowed in contest – IMO accepts pure synthetic or analytic).

Redraw cleanly. Mark given equalities, angles, midpoints, tangents. 106 geometry problems

This is a tall order, but a great one. 106 Geometry Problems (often referring to the book by Titu Andreescu, Vlad Crisan, and Bogdan Enescu, or the classic "103 Trigonometry Problems" / "106 Geometry Problems" from the AwesomeMath series) is an for high school students targeting Olympiads (IMO, USAMO, etc.). If stuck for 20 min, switch to coordinates/complex

What would prove it? Congruence? Concyclicity? Equal angles? Equal products (Power of a point)? Collinearity (Menelaus)? If stuck for 20 min

Common tricks: reflect a point across an angle bisector, draw the second intersection of two circles, construct the circumcircle of three points.