Circle and Semicircle

A segment that crosses the outside of the circle at two or more points and continues past the circle.

• Secant

• Tangent

• Chord

• Segment

A segment that touches a circle at exactly one point.

• Tangent

• Segment

• Secant

• Chord

The distance around the circle (perimeter)

• Circumference

• Area

• Circle

• Length

A segment of the circumference of a circle.

• Arc

• Tangent

• Major Arc

• Tangent

An arc that measures less than 180 degrees

• Minor Arc

• Major Arc

• Arc

• Angle

An angle whose vertex is the at the center of a circle.

• Central Angle

• Inscribed Angle

• Obtuse Angle

• Acute Angle

An arc that measures between 180 and 360 degrees.

• Major Arc

• Minor Arc

• Arc

• Semicircle

The portion inside of the circle

• Area

• Circumference

• Angle

• Arc

Half of a circle

• semicircle

• circumference

• sector

• inscribed angle

A segment that has both endpoints on the circle. ( Does NOT have to pass through the center)

• radius

• circumference

• chord

• diameter