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Circle;
Set of points in space that are equidistant from a given point called the center.

Chord;
A segment who's endpoints are on the circle.

Secant;
A line that intersects the circle in exactly two points.

Tangent;
Line that intersects the circle in exactly one point.

Point Of Tangentcy;
The point where the tangent line intersects the circle.

Congruent Circles;
Circles that have the same radius.

Concentric Circle;
Circles that have the same center.

Tangent Circles;
Two coplanar circles that intersect at exactly one point.

Common Tangent;
A line that is tangent to two circles.

Diameter;
Chord containing the center.

Central Angle;
Angles who's vertex is the center of the circle.

Minor Arc;
Arc that is itersepted by a central angle, less then 180.

Major Arc;
Arc in the exterior of a central angle, more the 180.

SemiCircle;
Half a circle.

Inscibed Angle;
Angle whose vertex is on a circle and whose sides contain chords of the circle.

