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6 triangles with equal areas

Source: Singapore Senior Math Olympiad 2000 2nd Round p1 SMO

April 4, 2020
triangle areaequal areasareasgeometry

Problem Statement

In ABC\vartriangle ABC, the points D,ED, E and FF lie on AB,BCAB, BC and CACA respectively. The line segments AE,BFAE, BF and CDCD meet at the point GG. Suppose that the area of each of BGD,ECG\vartriangle BGD, \vartriangle ECG and GFA\vartriangle GFA is 11 cm2^2. Prove that the area of each of BEG,GCF\vartriangle BEG, \vartriangle GCF and ADG\vartriangle ADG is also 11 cm2^2. https://cdn.artofproblemsolving.com/attachments/e/7/ec090135bd2e47a9681d767bb984797d87218c.png