Content Analysis: The famous (infamous?) "windmill"

Photo Gallery

Olympiad Geometry Problem #37: IMO 2018 #1
Ep37 - Tricky geometry sums, Olympiad made easy, learn Mathematics
How to prepare your Geometry for the IMO and other math competitions
Solving An Insanely Hard Problem For High School Students
The unexpectedly hard windmill question (2011 IMO, Q2)
Olympiad Geometry Problem #25: Midpoint, Perpendiculars, Parallels
Olympiad Geometry Problem #93: Two Isosceles Triangles, Circumcircle, Perpendicular
Olympiad Geometry Problem #69: Tangents, Secant, Perpendicular
Olympiad Geometry Problem #38: IMO Shortlist 2012 G4
Olympiad Geometry Problem #19: Angle Bisector, Perpendiculars, Midpoint
The KEY to solving all Geometry Problems. The Good Point Bad Point Method.
Olympiad Geometry Problem #73: IMO Shortlist 2005 G6