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A shape consisting of those points in a plane which are equidistant from a given point called the center.

Pi (π)

The ratio of the circumference to the diameter of a circle.


A line from the center of the circle of the circle to any point on the circle.


more than 1 radius.


A line segment that links 2 points on a circle.


A chord that crosses through the center of the circle.


A line or ray that interests a circle at only 1 point.

Point of Tangency

The point where a circle and a tangent intersect.


Part of a circle with an angle measure.

Minor Arc

Arc whose measure is smaller than 180 degrees.

Major Arc

Arc whose measures is larger than 180 degrees.


Arc whose measure is equal to 180 degrees.

Central Angle

An angle whose vertex is a center of a circle.

Congruent Circles

Circles with congruent radii.

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