File:Ceva's_theorem_1.svg · Wikimedia Commons · See Wikimedia Commons
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Encyclopedic overview
Ceva's theorem, case 1: the three lines are concurrent at a point O inside △ABC
Ceva's theorem, case 2: the three lines are concurrent at a point O outside △ABC
Excerpted from Wikipedia’s “Ceva's theorem” article, available under the CC BY-SA 4.0 licence.