Circles

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Part	Description	Example	Properties
Center	A point in a plane from which all points on the circle are equidistant	O is the center	A circle can have only one center
Radius	A line segment with one end point at the center and other end point on the circle	OP is a radius	The radius is always half the diameter R = d/2. A circle can have an infinite radii. (plural of radius)
Diameter	A chord that passes through the center of a circle.	AB is a diameter.	A diameter is twice the radius d = 2r. It is always passes through the center. It is the longest chord of a circle.
Circum- ference	The length of a boundary of a circle.	O is the center	Every point on the circumference is equidistant from the center.
Chord	A line segment whose end points are on the circle.	PQ is a chord.	A chord can be of any length.It may or may not pass through the center. Diameter is the longest chord.
Arc	A part of a circle between any two points on the circle.	PQR is an arc.	It can be of any length. The bigger arc is called major arc and the smaller arc is called minor arc.
Segment	A chord divides a circle into two parts called segments.	PQR is an arc.	PQR is a minor segment . RSP is the major segment.
Sector	The region enclosed by two radii and an arc.	sector AOB	The smaller sector is called minor sector and the bigger sector is called major sector.
Semicircle	Half circle.		Diameter of a circle divides it into two semicircles.