Online Geometry Problems

Geometry Problem 1088: Triangles, Perpendicular, Concurrent Lines. Level: High School, SAT Prep, College, Math Education


The figure below shows a triangle ABC and a triangle A1B1C1 so that A1A2, B1B2, and C1C2 are perpendicular to BC, AC, and AB, respectively, and are concurrent at O1. If AA3, BB3, and CC3, are perpendicular to B1C1, A1C1, and A1,B1, respectively, prove that AA3, BB3, and CC3 are concurrent at O2.

Infographic Geometry problem 1088: Triangles, Perpendicular, Concurrent Lines


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Last updated: Feb 21, 2015