Center of a circle
The point that all points in the circle are equidistant from.
Central angle of a circle
An angle whose vertex is the center of the circle.
Chord of a circle
A segment whose endpoints are on a circle.
The set of points on a plane at a certain distance (radius) from a certain point (center); a polygon with infinite sides.
An arc whose endpoints form an angle less than 180 degrees with the center of the circle.
An arc whose endpoints form an angle over 180 degrees with the center of the circle.
Plural form of radius.
The segment whose endpoints are any point on a circle or sphere and its center; the length of that segment.
Secant to a circle
A line that intersects the circle in two points.
An arc whose central angle is a right angle.
Tangent to a circle
A line that intersects the circle in just one point, called point of tangency.
Interactive Geometric Applets: Relevant Theorems.
Secants intersecting at exterior point.
Tangents intersecting at exterior point are congruent.
Tangent and secant intersecting at exterior point.
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