5.1a Circles

5.1a Circles
5.1.1 Parts of a Circle
1. A circle is set of points in a plane equidistant from a fixed point.

Parts of a circle:
(a)    The centre, O, of a circle is a fixed point which is equidistant from all points on the circle.

(b)   A sector is the region enclosed by two radii and an arc.

(c)    An arc is a part of the circumference of a circle.

(d)   A segment is an area enclosed by an arc and a chord.


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