Answer:
OAC = 45
Step-by-step explanation:
AD is tangent so it is 90 degrees
We have a triangle whose angles add to 180 degrees
OAC + ACO + COA = 180
OAC + 90+ 45 = 180
Combine like terms
OAC +135 = 180
OAC +135-135 = 180-135
