1.
AB is tangent to circle O at B. The diagram is not drawn to scale.
If AB = 9 and AO = 21.6, what is the length of the radius (r)? Round the answer to the nearest tenth. (1 point)

19.6
15.3
23.4
12.6

Question

1.  
AB is tangent to circle O at B. The diagram is not drawn to scale. 
If AB = 9 and AO = 21.6, what is the length of the radius (r)? Round the answer to the nearest tenth.  (1 point)

    19.6
    15.3
    23.4
    12.6

anonymous · Answer

attachment

anonymous · Answer

help please

anonymous · Answer

please help, I think the answer is 19.6

anonymous · Answer

$$(AO)^{2}=(AB)^{2}+(BO)^{2}$$

anonymous · Answer

? Im so confused

anonymous · Answer

This is a very big test, tomorrow is the last day of school and im behind because ive had family stuff going on.

anonymous · Answer

substitute by 
AO=21.6
AB=9
then find BO=r

anonymous · Answer

Thats what i did earlier to get 19.6. I think that is right but im not 100% sure