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A contiguous segment of the circumference of a circle.

Circles that share the same center but have different radii.

The region of a circle bounded by two radii and the intercepted arc.

A chord that passes through the center of the circle, calculated as $d = 2r$

A mathematical constant, approximately equal to 3.14159, representing the ratio of a circle's circumference to its diameter.

The perimeter of a circle, calculated with the formula $C = 2\pi r$ or $C = \pi d$

The distance from the center of the circle to any point on its circumference, represented by the letter r.

A line that intersects a circle at two points.

The space enclosed by the perimeter of the circle, calculated with the formula $A = \pi r^2$

A segment whose endpoints lie on the circle.

An angle formed by two chords in a circle which share an endpoint.

A line that intersects the circle at exactly one point.

An angle whose vertex is at the center of the circle and whose sides are radii.

A quadrilateral where all four vertices lie on the circumference of a circle.

Circles that have the same shape but differing sizes; their radii are proportional.

A line or segment that is tangent to two circles.

Two circles that intersect at exactly one point.

The minimum number of colors needed to color a plane such that no two points at distance exactly one from each other have the same color; for a circle, it equals 2.

The region between two concentric circles of different radii.