Circle Geometry Vocabulary

A line that touches the circle only once.

• diameter

• radius

• tangent

• chord

A line that goes through a circle intersecting the circle at two points.

• diameter

• chord

• tangent

• secant

The short way around a circle that is less than 180 ^o.

• Minor Arc

• Major Arc

• Semi-Circle

• Central Angle

When the distance from one point to the next on the circle is exactly 180^o (half of a circle).

• Minor Arc

• Major Arc

• Semi-Circle

• Central Angle

The long way around a circle that is greater than 180 ^o.

• Minor Arc

• Major Arc

• Semi-Circle

• Central Angle

Give an example of a chord

• line segment HI

• line segment KL

• line segment GH

• line segment GJ

Give an example of a radius

• line segment HI

• line segment KL

• line segment GH

• line segment GJ

Name a minor arc

• arc AD

• arc ADB

• arc AB

• arc CD

Name a major arc

• arc AD

• arc ADB

• arc AB

• arc CD

A segment whose endpoints lie on a circle is a _______.

• tangent

• chord

• diameter

• secant