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• 03:56, 19 May 2024 Amitwa.exe (talk | contribs) uploaded File:Triangle area ratio lemma.jpg (If in a $\triangle ABC, D,E$ and $F$ are on $AB, BC, AC$ such that $AD:DB=1:a, BE:EC=1:b$ and $FC:FA=1:c$ Then $[DEF]=\left|\frac{[ABC](1+abc)}{(1+a)(1+b)(1+c)}\right|$)