60 POINTS I NEED ANSWER FAST. WILL MARK BRAINLIEST.

Step-by-step explanation:
Here,
Triangle ADC and triangle ABD are similar triangle as they are similar by A.A.A axiom.
now, as they are similar their sides are proportional to eachother,
CD/BD : AB/AC : AD/AD
4.3/4 : AB/5.6 : AD/AD.
Taking 1st and srcond ratios we get,
4.3/4=AB/5.6
or, 4AB = 5.6×4.3 (cross multiplication)
Therefore, the measure of AB is 6.02 or 6.
Hope it helps...