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max triangle area, starting with intersecting circles

Source: 2007 Oral Moscow Geometry Olympiad grades 10-11 p2

October 19, 2020
geometrycirclesarea of trianglemax

Problem Statement

Two circles intersect at points PP and QQ. Point AA lies on the first circle, but outside the second. Lines APAP and AQAQ intersect the second circle at points BB and CC, respectively. Indicate the position of point AA at which triangle ABCABC has the largest area.
(D. Prokopenko)