106 Geometry Problems ((new)) 【Must Try】
(The bread and butter of Olympiad geometry) The Advanced Problems
Take Problem 12. It asks you to prove that three distinct points lie on a single line. You look at the diagram. They don't look like they line up. They look chaotic. The skeptic in you says it is impossible; the geometer in you knows that intuition is a liar. This is the first lesson of the 106: the eyes are not to be trusted. Only the proof speaks the truth. 106 geometry problems
The "Q.E.D." at the bottom of the page— Quod Erat Demonstrandum —is not just a sign-off. It is a sigh of relief. It is the closing of a loop. (The bread and butter of Olympiad geometry) The
