Determine the value of angle ZOMB.

Analysis:

1. The image displays three geometric problems involving circles. The first problem (labeled 'a)') shows a circle with center O, a chord AB, and a point M on the chord. There are tick marks indicating that OM is perpendicular to AB.
2. We are asked to find the measure of angle ZOMB. Since OM is perpendicular to AB, angle OMB is a right angle.

Answer:

ZOMB = 90°