Answer:
Based on the results in part A and part B, where we established that the radius of a circle is perpendicular to the tangent line at the point of intersection, we can conclude that the radius and the tangent line form a right angle (∠90 degrees) at the point of intersection.
This conclusion is derived from the properties of circles and tangents. A tangent to a circle at a point is always perpendicular to the radius drawn to that point. This property is fundamental to the geometry of circles and tangents and can be proven using concepts such as the perpendicular bisector of a chord, which intersects the circle's center and is perpendicular to the chord. Therefore, the conclusion that the radius and tangent line form a right angle at the point of intersection is consistent with the basic principles of circle geometry.