The midpoint of segment AB with length of 18cm is m, and point C is on segment MB, and CB = 2mc (1) Find the length of CB; (2) Find the length of line AC

The midpoint of segment AB with length of 18cm is m, and point C is on segment MB, and CB = 2mc (1) Find the length of CB; (2) Find the length of line AC

CB=6,AC=12