Geometry Problem 103. Equilateral Triangle Area, Interior Point, Heron.
Level: High School, College, SAT Prep.
In the figure below, given an
equilateral triangle ABC, D is an interior point. If
AD = d, BD = e, CD = f, and \(s=\dfrac{d+e+f}{2}\),
prove that the area S of triangle ABC is:
USE

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