Given:
Line NO is tangent to the circle at P.
To determine the mWe also note the rule that when the vertex of the angle is on a circle, the measure of angle is half the measure of its intercepted arc. So,

Since NO is a straight line, the angle is 180°. Hence, we can get the m
Therefore, the answer is:
![m\operatorname{\angle}OPQ=133.5\operatorname{\degree}]()