Answer
90 degrees
Step-by-step explanation:
The tangent line is the line that cuts the circumference of the circle. From the diagram, the line "l" is tangential to the circumference of the circle at point P.
Also, the line PQ is perpendicular to the line l, hence the measure of the angle formed at the point of tangency will be the angle that the line PQ formed with the line "l" which is 90 degrees