Angle bisector theorem: CD/DB=AC/AB Replacing the known values: 2/DB=5.9/8.1 Solving for DB. Cross multiplication: (2)(8.1)=(5.9)(DB) 16.2=5.9DB Dividing both sides by 5.9 (16.2)/5.9=(5.9DB)/5.9 2.745762712=DB DB=2.745762712 Rounded to one decimal place: DB=2.7
