SHARYGIN 2007 Problem 5
A non-convex -gon is cut into three parts by a straight line, and two parts are put together so that the resulting polygon is equal to the third part. Can be equal to: a) (8) five? b) (8-10) four?
Official text Sharygin Geometry Olympiad 2007 official paper, page 1. Quoted with source.
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