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
Secant - is a line that intersects the circle at two points
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
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