Secants, Tangents, and Angles

Circle X is shown in the diagram. Which equation can be used to solve for m∠1?

1/2(c + d)

In the diagram of circle P, m∠XYZ is 72°. What is the value of x?

108°

In circle Z, what is m∠2?

140°

What is mPO?

173°

In the diagram of circle O, what is the measure of ABC?

30°

In the diagram of circle O, what is the measure of ?

54°

What is mSU?

77°

Which equation is correct regarding the measure of ∠1?

m∠1 = 1/2(b - d)

Which equation is correct regarding the measure of ∠MNP?

m∠MNP = 1/2(x - y)

Which equation is correct regarding the diagram of circle O?

m∠XZY = 1/2(a - b)