**Circle**is the set of all points in a plane that are equidistant from a given point in the plane known as the center of the circle.

**Chord -****is a segment whose endpoints lie on a circle**

**is a line that intersects the circle at two points**

Secant -Secant -

**Diameter is the longest secant in a circle.**

**Tangent -**is a line in the plane of the circle that intersects the circle at exactly one point**Sector -The part of a circle enclosed by two radii of a circle and an arc.**

**The cut piece of pizza is minor sector and the remaining is the major sector.**

**Semi-circle -****is an arc whose endpoints are endpoints of a diameter**