Use the relationship between the angles in the figure to answer the question.
which equation can be used to find the value of x?

Look into my attachment, I named the point so you can easily understand

∠AOB, ∠BOC, ∠COD are supplementary angles
∠AOB + ∠BOC + ∠COD = 180°
28° + ∠BOC + 49° = 180°
∠BOC = 180° - 49° - 28°
∠BOC = 103°

x° and ∠BOC are vertical angles, so the number of those angles is the same
x° = ∠BOC
x° = 103°

The answer is "a"radius = 12.7 unitsdiameter = radius × 212.7 units × 2 = 25.4 units

Idon’t understand this but 90