Answer:
B. 5/6
Step-by-step explanation:
If we take 10:12 because they are similar sides, we get 10/12, or 5/6
If we take 15:18 because they are similar sides, we get 15/18, or 5/6
We know they are similar because they have the same ratio for both sides, 5/6, and have the same number as an angle.
