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In triangle $ABC$, $AB=10$, $CA=12$. The bisector of ∠B intersects $CA$ at $E$, and the bisector of ∠C
intersects $AB$ at $D$.
$AM$ and $AN$ are the perpendiculars to $CD$ and $BE$ respectively. If $MN=4$, then how can I find $BC$?
Required, but never shown
9 days ago