A circle is the set of all points in a plane that are equidistant from a fixed point in the plane. the fixed point is the center of the circle and the fixed distance is the radius.
The following are some terms related to the circle:
1. Radius - is also used to name a line segment that joints the center of the circle to the point on the circle.
2. Chord - is a segment whose end points are any two points on the circle.
3. Diameter - is a chord which passes through the center of a circle. It is twice the length of the radius. The word "diameter" can also refer to a segment or the length of a segment.
4. Secant - is a line that contains a chord.
5. Tangent - to a circle is a line, a ray or a segment in the plane of a circle that intersects the circle at exactly one point (point of tangency).
Other basic terms needed in the study of the circle are illustrated and define as follows:
1. Central angle - is an angle formed by two radii of the circle with its vertex in the center of the circle.
2. Arc - is a connected part or portion of a circle. If it is half a circle, it is called a semicircle. if an arc is less than half a circle, it is called minor arc. If an arc is more than half a circle it is called major arc.
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