Answer:
9 units
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.
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