A tangent is drawn to a circle with a radius of 5 cm. At the point of tangency, what is the angle between the tangent and the radius?

A fundamental property of circles states that:

The tangent to a circle at any point is perpendicular to the radius drawn to the point of tangency.

Since the radius is drawn to the point where the tangent touches the circle, the angle between the tangent and the radius is always:

$ \angle(\text{radius, tangent}) = 90^\circ $