Unit 11 Intro_ Identify the Parts of a Circle

A round figure whose boundary consists of points equidistant from a fixed point (the center).

Example: ⊙J

• Chord

• Central Angle

• Circle

• Secant

Answer explanation

A line that intersects a circle at one point

Example: Line 𝑋𝑀

• Tangent

• Secant

• Chord

• Radius

Answer explanation

A segment that has endpoints on the circle

Examples: Segment 𝐴𝐶 , Segment 𝐺D

• Diameter

• Chord

• Point of Tangency

• Circle

Answer explanation

A line that intersects a circle at two points

Example: Line 𝐴C

• Tangent

• Diameter

• Chord

• Secant

Answer explanation

The point on a tangent that is on the circle.

Example: Point X

• Point of Tangency

• Radius

• Secant

• Tangent

Answer explanation

A segment that goes through the center of the circle and has endpoints on the circle

Example: Segment 𝐺𝐷

• Radius

• Secant

• Diameter

• Chord

Answer explanation

A segment with one endpoint on the circle and one endpoint at the center. It’s half the diameter.

Examples: 𝐺𝐽, 𝐽𝐹, 𝐽D

• Tangent

• Radius

• Point of Tangency

• Diameter

Answer explanation

An arc with a measure of more than 180 degrees

Example: arc 𝐹𝑋𝐷

• Minor Arc

• Major Arc

• Central Angle

• Semicircle

An angle with its vertex at the center of the circle

Example: ∠FJD

• Minor Arc

• Major Arc

• Central Angle

• Semicircle

An arc with a measure of exactly 180 degrees.

Example: 𝐺𝐹𝐷

• Minor Arc

• Major Arc

• Central Angle

• Semicircle