MathDB
perpendiculare segments inside a regular 9-gon

Source: May Olympiad (Olimpiada de Mayo) 2015 L2

September 10, 2018
geometryperpendicularregular polygon

Problem Statement

Let ABCDEFGHIABCDEFGHI be a regular polygon of 99 sides. The segments AEAE and DFDF intersect at PP. Prove that PGPG and AFAF are perpendicular.
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