Final answer:
To determine angle R where segment CR is tangent to circle T, one needs to use the property that a tangent at a circle is perpendicular to the radius at the point of tangency, forming a 90-degree angle. Further information would be required to calculate R specifically.
Step-by-step explanation:
The subject in question pertains to the tangent to a circle and finding an angle related to it, which is a typical problem in high school geometry or trigonometry. In general, when a segment is tangent to a circle at a point, the angle between the tangent and the radius drawn to the point of tangency is 90 degrees. This is based on the property that a tangent to a circle is perpendicular to the radius at the point of tangency. To find angle R in this context, one would typically need more information about the specific geometry of the circle and any associated angles or lengths provided in the original problem.