Terms Related to Circles

A plane figure consists of points equidistant from a fixed point (called center).

• Tangent Line

• Chord

• Circle

• Quadrilateral

It is the length of the line from the center to any point on its edge.

• Radius

• Diameter

• Chord

• Arc

A a chord that passes through the center and divides the

circle into two semicircles.

• Radius

• Diameter

• Chord

• Arc

A segment where its two endpoints lies on the circle.

• Radius

• Diameter

• Chord

• Arc

A line that intersects a circle at exactly two points.

• Chord

• Secant

• Tangent Line

• Central Angle

A line that intersects a circle at exactly one points.

• Chord

• Secant

• Tangent Line

• Central Angle

The point where the tangent line touches the circle.

• Point of Tangency

• Secant

• Tangent Line

• Central Angle

A part of the circle.

• Radius

• Chrord

• Diameter

• Arc

An arc measuring one-half of the circumferences of the circle.

• Major Arc

• Minor Arc

• Secant

• Semicircle

An angle formed by two rays whose vertex is the center of the circle.

• Minor Arc

• Major Arc

• Inscribed Angle

• Central Angle