The measure of arc PQ in circle T can be calculated if we know the angles and the relationships between the points T, P, Q, and R. Generally, the measure of an arc can be found using the central angle that subtends the arc.
For example, if angle PTQ is the angle at the center of the circle corresponding to arc PQ, then the measure of arc PQ is equal to the measure of angle PTQ in degrees. If angle PTQ is not given directly, we might need to use other angles or relationships in the diagram to find it.
Assuming we know the measure of angle PTQ and it is represented as X degrees, then the measure of arc PQ would simply be X degrees. Always remember, the measure of an arc is directly related to its corresponding central angle!