Question
In a triangle ABC, the internal bisector of ∠A meets
side BC at D. If AB = 6 cm, AC = 9 cm, and BC = 12 cm, what is the length of BD?ÂSolution
Using the Angle Bisector Theorem, BD / DC = AB / AC 6 / 9 = 2 / 3. Since BD + DC = 12, BD = (2 / 5) × 12 = 4.8\ Correct answer: a) 4.8 cm
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