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It has become obvious that the Shapes category was in way over its head with all sorts of geometrical problems. So, the hard-core Geometry problems will now reside here, where they will fit in much better.
You are given a regular decagon A1 A2 ... A10 . Let A be the intersection point of lines A1 A4 and A2 A5 , B is the point of intersection of lines A1 A6 and A2 A7 , and C is the point of intersection of lines A1 A9 and A2 A10 . Find the angle of ABC.
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