HMMT 2018 G2

Points $A, B, C, D$ are chosen in the plane such that segments $A B, B C, C D, D A$ have lengths $2,7,5$, 12 , respectively. Let $m$ be the minimum possible value of the length of segment $A C$ and let $M$ be the maximum possible value of the length of segment $A C$. What is the ordered pair $(m, M)$ ?