iran-konkur 2018 Q128

iran-konkur · Other · konkur-riazi_1397_specialized Sine and Cosine Rules Multi-step composite figure problem
128. In triangle $ABC$, the side lengths are $BC = 9$, $AC = 8$, and $AB = 2$. The angle bisectors of angle $A$ intersect side $BC$ at $M$ and $N$. What is the length of $MN$?
(1) $4/2$ (2) $4/5$ (3) $4/8$ (4) $5/1$
\textbf{128.} In triangle $ABC$, the side lengths are $BC = 9$, $AC = 8$, and $AB = 2$. The angle bisectors of angle $A$ intersect side $BC$ at $M$ and $N$. What is the length of $MN$?

\hspace{1cm} (1) $4/2$ \hspace{2cm} (2) $4/5$ \hspace{2cm} (3) $4/8$ \hspace{2cm} (4) $5/1$