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Problem 30: (2013 AMC 12b, 24)
Let $ABC$ be a triangle where $M$ is the midpoint of $\overline{AC}$, and $\overline{CN}$ is the angle bisector of $\angle{ACB}$ with $N$ on $\overline{AB}$. Let $X$ be the intersection of the median $\overline{BM}$ and the bisector $\overline{CN}$. In addition $\triangle BXN$ is equilateral with $AC=2$. What is $BX^2$?
$\textbf{(A)}\ \frac{10-6\sqrt{2}}{7} \qquad$ $ \textbf{(B)}\ \frac{2}{9} \qquad$ $ \textbf{(C)}\ \frac{5\sqrt{2}-3\sqrt{3}}{8} \qquad$ $ \textbf{(D)}\ \frac{\sqrt{2}}{6} \qquad$ $ \textbf{(E)}\ \frac{3\sqrt{3}-4}{5}$
Solution
Exercise 30: Solution
In $\triangle ABC$, $AB=6$, $AC=8$, and $BC=10$. The bisector of $\angle A$ meets $\overline{BC}$ at $D$, and the line through $D$ parallel to $\overline{AB}$ meets $\overline{AC}$ at $E$. What is $DE$?
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