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This is my version of the test U7 L7 Circles Unit test 1. AB is tangent to circle O at B. If AB=6 and AO=11.7, what is the length of the radius (r)? A:5.7 B:8.9 C:10.0 D:13.1 Answer: C: 10.0 2. Assume that lines that appear to be tangent are tangent. O is
