Line segment KL is tangent to circle J at point K. Circle J is shown. Line segment J K is a radius with length r. Line segment K L is a tangent with length 24 and it intersects the circle at point K. A line is drawn from point L to point J and goes through a point on the circle. The length from point L to the point on the circle is 16. The length from the point on the circle to center point J is r.

What is the length of the radius, r?

8 units
10 units
12 units
16 units