IF AB = 9 and AO = 21.6, what is the length of the radius (r)? Round the answer to the nearest tenth.
15.3
21.2
19.6
12.6
We can use the Pythagorean theorem to solve this.
r^2 = AO^2 - AB^2
r^2 = 21.6^2 - 9^2
r^2 = 466.56 - 81
r^2 = 385.56
r = 19.6 (rounded to the nearest tenth)
Therefore, the length of the radius (r) is 19.6.