Answer:
4/49
Step-by-step explanation:
7-5 = 2
2/7*2/7 = 4/49
There's the obvious symmetry ultimately because the radii OA and OB are hypotenuses of congruent right triangles. We can just eyeball the figure and see AB=BC, at least approximately, so the full chord AC=9+9=18
Answer: A. 18 units
