PARTS OF CIRCLES DICTIONARY

Circle :

The set of points equidistant from a given point (the center).

Radius :

A segment with endpoints at the center and on the circle.

Chord :

A segment with endpoints and on the circle.

Diameter :

A chord that passes through the center.

(Diameter = 2 ⋅ Radius)

Secant :

A line that intersects the circle in two places.

Tangent :

A line that intersects the circle at exactly one place.

Point of Tangency :

The point at which the tangent line intersects the circle. In the above diagram, B is the point of tangency.

Central Angle :

An angle with a vertex at the center, and two sides that are radii.

Inscribed Angle :

An angle with a vertex on the circle, and two sides that are chords.

Arc :

A portion of the edge of the circle defined by two end points.

Minor Arc :

An arc with measure less than 180°.

* Use 2 letters to name it !

Major Arc :

An arc with measure greater than 180°.

* Use 3 letters to name it !

Diameter :

An arc with end points on the diameter.

* Always equal to 180° !

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