100 points A box contains 8 rings, 10 necklaces, and 4 pins. If Anya selects 1 piece at random, does NOT replace it, and then picks another, what is the probability that she selected 2 rings?

If m<COD = 95 degrees, that makes m<AOB a vertical angle to m<COD. That means that you subtract 180 - 95 and you get 85 degrees.

m<AOB = 85 degrees.

My problem with the wording of this problem is that it states that chords AC and BD are perpendicular. That would make both m<COD and m<AOB equal to 90 degrees. But I answered the problem based on your statement that m<COD = 95.