Circle Vocab
Central Angles
Inscribed Angles
Interior Angles
Exterior Angles
100
A chord that passes through the center
What is a diameter?
100
Find m∠arc PRQ.
m∠arc PRQ = 275°
100
An arc has a measure of 80°. What is the measure of the inscribed angle that intercepts that arc? Draw a picture to represent the situation.
The measure of the angle is 40°
100
Find x.
x = 100°
100
An angle outside a circle intercepts arcs that are 100° and 50°. Find the measure of the angle.
25°
200
A straight line segments whose endpoints lie on the edge of the circle.
What is a Chord?
200
Find m∠arc BC.
m∠arc BC = 57°
200
A central angle measures 84°. What is the measure of the arc it intercepts? Draw a picture to represent the situation.
The measure of the arc is 84°
200
Find x.
x = 117°
200
An angle outside a circle intercepts arcs that are 170° and 40°
65°
300
A line that intersects a circle in exactly one point.
What is a Tangent?
300
Find m∠arc CD. 
m∠arc CD = 55°
300
What is m∠ACB?
m∠ACB = 69°
300
An angle created by two intersecting chords intercepts arcs that are 36° and 56°. What is the measure of the angle created by the intersecting chords? Draw a picture to represent the situation.
46°
300
Find x.
x = 124°
400
A line that intersects a circle in two points.
What is a Secant?
400
Find m∠arc QP.
m∠arc QP = 45°
400
What is the measure of arc AC?
The measure of arc AC is 120°
400
Find x.
Replace 19° with 12°. Replace 107° with 124°.
x = 68°
400
An angle created outside the circle measures 50°. One of the arcs it intercepts measures 200°. Find the measure of the other arc.
100°
500
The distance from the center of the circle to the edge, half of the diameter.
What is a Radius?
500
Find m∠arc QTR.
m∠arc QTR = 306°
500
Find the value of x. 
The value of x is 160°
500
Find x.
Replace 129° with 150°. Replace 71° with 98°.
x = 124°
500
An angle created outside the circle measures 30°. One of the arcs it intercepts measures 150°. Find the measure of the other arc.
90°