Point B serves as a point of tangency in the circle, where the tangent line AB meets the circumference at a single point, perpendicular to the radius at that specific point.
Point B is a point of tangency. A point of tangency is a point on the circumference of a circle where a tangent line meets the circle. A tangent line is a line that touches the circle at exactly one point, and it is perpendicular to the radius at that point.
In the image you provided, we can see that line AB is a tangent line to the circle at point B. This means that line AB touches the circle at exactly one point, point B, and it is perpendicular to the radius at point B.
Therefore, point B is a point of tangency.