Problems Best: 106 Geometry

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.).

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

Do you see: cyclic quad? right triangle? homothety between incircle/excircle? radical axis? spiral similarity? This is a tall order, but a great one

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