106 Geometry Problems |best| -

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

Do you see: cyclic quad? right triangle? homothety between incircle/excircle? radical axis? spiral similarity? 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.). Common tricks: reflect a point across an angle