Question

AB is tangent to circle O at B. What is the length of the radius r? Round to the nearest tenth.

7.0

3.6

13.0

9.9

Answer 1

check the picture below.

bearing in mind that the point of tangency, in red, is always a right-angle.

Answer 2

The length of the radius r for AB = 5 and AO = 8.6 is 7. The correct answer between all the choices given is the first choice or letter A. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.