Question

what is $overline{kj}$? center diameter radius

Explanation:

In a circle, the radius is a line - segment from the center of the circle to a point on the circle. Here, point $K$ is the center of the circle and point $J$ is a point on the circle. So, $\overline{KJ}$ is a line - segment from the center to a point on the circle.

Answer:

radius