Line segment YZ is a tangent to circle X , and X is the center of the circle. What is the length of the radius of the circle?
A.12.8
B.12
C.6
D.4
![Line segment YZ is a tangent to circle X and X is the center of the circle What is the length of the radius of the circle A128 B12 C6 D4 class=](https://us-static.z-dn.net/files/d83/4f58364bd120934a34c138fdbf500cd1.png)