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Online Geometry Problem 805: Stewart's Theorem, Triangle, Sides, Cevian,
Metric Relations, Measurement. Level: High School,
SAT Prep, College,
Mathematics Education
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Let be given a triangle ABC and a point
D on AB such that m = AD, n = BD, and x = CD. Then Stewart's theorem,
also called Apollonius' theorem, states that:  .
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