This figure shows △ABC. BD¯¯¯¯¯ is the angle bisector of ∠ABC. What is AD? Enter your answer, as a decimal, in the box. units A triangle with vertices labeled as A, B, C. Side A C is base. Side A C contains a midpoint D. A line segment drawn from B to D bisects angle A B C into two parts labeled as A B D and C B D. Angles A B D and C B D are marked with single arc. Side A B is labeled as 4.5. Side C D is labeled as 4. Side B C is labeled as 5.