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- 1. Multiple-choice1 minute1 pt
The set of all points in a plane that are equidistant from a given point.

Circle

Semicircle

Half Circle

Point

- 2. Multiple-choice1 minute1 pt
The point in the middle. The point is used to name the circle.

Center of a Circle

Point

Middle Dot

Segment

- 3. Multiple-choice1 minute1 pt
The distance from the center of a circle to a point on the circle. Endpoints are the center and a point on the circle.

Radius

Circumference

Diameter

Segment Length

- 4. Multiple-choice1 minute1 pt
Distance across a circle, through the center of the circle.

Diameter

Radius

Chord

Segment

- 5. Multiple-choice1 minute1 pt
A segment whose endpoints are points on the circle.

Chord

Tangent

Secant

Angle

- 6. Multiple-choice1 minute1 pt
A segment that crosses the outside of the circle at two or more points and continues past the circle.

Secant

Tangent

Chord

Segment

- 7. Multiple-choice1 minute1 pt
A segment that touches a circle at exactly one point.

Tangent

Segment

Secant

Chord

- 8. Multiple-choice1 minute1 pt
The distance around the circle (perimeter)

Circumference

Area

Circle

Length

- 9. Multiple-choice1 minute1 pt
A segment of the circumference of a circle.

Arc

Tangent

Major Arc

Tangent

- 10. Multiple-choice1 minute1 pt
An arc whose endpoints of the circles diameter (half the circle).

Semicircle

Moon

Arc

Circumference

- 11. Multiple-choice1 minute1 pt
An arc that measures less than 180 degrees

Minor Arc

Major Arc

Arc

Angle

- 12. Multiple-choice1 minute1 pt
An arc that measures between 180 and 360 degrees.

Major Arc

Minor Arc

Arc

Semicircle

- 13. Multiple-choice1 minute1 pt
An angle whose vertex is the at the center of a circle.

Central Angle

Inscribed Angle

Obtuse Angle

Acute Angle

- 14. Multiple-choice1 minute1 pt
An angle whose vertex lies of the circle and both endpoints lie across the circle.

Inscribed Angle

Central Angle

Angle

Arc

- 15. Multiple-choice1 minute1 pt
The portion inside of the circle

Area

Circumference

Angle

Arc