Which of the following is NOT true about the radius of a circle?

The statement that is not true about the radius of a circle is that it measures the distance around the circle. This is because the radius actually measures the distance from the center of the circle to any point on its circumference, rather than being a measurement of the distance around the entire circle, which is known as the circumference.

On the other hand, the radius being half the diameter is a fundamental characteristic of circles, as the diameter is defined as the longest chord of the circle that passes through the center. Likewise, it is accurate that the radius can connect any point on the circle to the center, illustrating its role as a line segment extending from the center to the edge. Lastly, describing the radius as a line segment is correct since it is indeed a straight line that connects two points: the center of the circle and a point on the circumference.