Another Relation between the Areas of Triangles Associated with an Excircle

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Let ABC be a triangle. Let D and E be the points of contact of the incircle of ABC with AB and AC. Let J be the excenter of the excircle opposite A and let G and F be the intersections of DJ and EJ with BC. Let , , and be the areas of GJF, DBG, and ECF, respectively. Then .

Contributed by: Jay Warendorff (March 2011)
After work by: Antonio Gutierrez
Open content licensed under CC BY-NC-SA


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The statement of the theorem is in Problem 188. Area of Triangles, Incenter, Excenter.



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