Answer:
9 units
Step-by-step explanation:
Line O bissects AC at its midpoint, creating a right angle. So, we know that AB is exactly 1/2 of AC.
Algebraically:
AB = AC/2
AB = 18/2
AB = 9 units
Hope this helps!
AB = 9
Perpendicular line from the center of the cirlcle to the chord bisects the chord.
