Circles Angles Arcs Vocab

What formula would you use to find m<1?

• angle = 1/2 (arc + arc)

• angle = 1/2 (arc - arc)

• angle = 1/2(arc)

• circumscribed angle = 180 - central angle

Answer explanation

<1 is created from the tangent line, m, and chord AB. 
angle = 1/2(intercepted arc)

What formula would you use to find m<x?

• angle = 1/2 (arc + arc)

• angle = 1/2 (arc - arc)

• angle = 1/2(arc)

• circumscribed angle = 180 - central angle

Answer explanation

<x is created from the secants that cross INSIDE the circle.

angle = 1/2 (arc + arc)

What formula would you use to find m<x?

• angle = 1/2 (arc + arc)

• angle = 1/2 (arc - arc)

• angle = 1/2(arc)

• circumscribed angle = 180 - central angle

Answer explanation

<x is created from the secants that cross OUTSIDE the circle.

angle = 1/2 (larger arc - smaller arc)

Identify the angle highlighted in blue.

• Center of the circle

• minor arc

• Central angle

• Inscribed angle

What type of angles are the two highlighted angles?

• Central angles

• Supplementary Angles

• Vertical Angles

• Inscribed Angles

What is true of the highlighted arc and angle in this picture?

• The angle = the arc

• The angle = half the arc

• Twice the angle = the arc

• Half the angle = the arc

What is true of the highlighted arc and angle in this picture?

• The angle = the arc

• The angle = half the arc

• There is no relationship

• Half the angle = the arc

Identify the arc highlighted in blue

• intercepted arc

• minor arc

• central angle

• inscribed angle

What is the measure of angle 2?

• 80

• 45

• 125

• 40

• A
• B
• C
• D