9-4 arcs and chords

In the diagram, O is the center of the circle. Find OM.

• 15

• 8

• 30

• 10

In the diagram, point O is the center of the circle. Find the measure of angle AOC.

• 70

• 110

• 140

• 165

Find the measure of arc CD.

• 40

• 60

• 80

• 100

Find the length of x and y.

• x = 8; y = 16

• x = 8; y = 8

• x = 10; y = 16

• x = 8; y = 10

Find x.

• 3

• $3\sqrt{3}$

• 6

• $6\sqrt{3}$

Find x and y.

• x = 7; y = 14

• x = 12; y = 24

• x = 12; y = 12

• x = 7; y = 12