Points m, n,d and e are on a circle with center k . also ed is a diameter of the circle. which line segments are radii of the circle

Since M,N.D, and E are points are on the circle and ED is the diameter, we only need to focus on the diameter because we are looking for the radii. A radii is a segment that starts from k, the center point and goes to the point on a circle. So using the diameter, ED, we can can say KE and KD are radii since they branch from the center of the circle to a point on the circle.