Ononot — In \\triangle ABC, D is a point on BC such that AD \\perp BC

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Euclidean 2Dmedium

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In $\\triangle ABC$ , $D$ is a point on $BC$ such that $AD \\perp BC$ . If $BD = 5$ , $DC = 9$ , and $AD = 12$ , what is the perimeter of $\\triangle ABC$ ?