Answer:
D. mZCAB = 70° and mLDAB = 20°
Step-by-step explanation:
An angle bisector is a line that divides a given angle into two equal parts. From the given question:
if angle CAD is divided into two unequal angles by AB, then AB is not an angle bisector of ZCAD.
For example: let mCAD = [tex]90^{o}[/tex]. Then if mCAB = mDAB = [tex]45^{o}[/tex], then AB is an angle bisector.
But if mCAB [tex]\neq[/tex] mDAB, then AB is not an angle bisector. Eg: mZCAB = 70° and mLDAB = 20°
