*INTRODUCTION:*

*You may have come across many objects in daily life, which are round in shape, such aswheels of vehicle, bangles, buttons of shirt, coins, key rings etc. In a clock, you might have observed that the second's hand goes round the dial of the clock rapidly and its tip moves in a round path.This path traced by the tip of the second's hand is called circle. In this chapter we will study about the circles and other related terms to it.*

*CIRCLES AND ITS RELATED TERMS:*

*1)LOCUS: It is defined as a path traced by the point such that each and every point of the path follows the same rule.*

*2)CIRCLE: It is defined as the locus of a point which moves in such a way that its distance always remains constant from some fixed point which is known as center of the circle and the constant difference is called radius of the circle.*

*3)SEMI CIRCLE: An arc of a circle whose end points are the end points of the diameter is called a semi-circle. The degree measure of a semi circle is 180.*

*4)ARC:The continuous part of a circle is called an arc.*

*5)Minor Arc:An arc of a circle having length less than the semi circle is called minor arc . The degree measure of minor arc is less than 180.*

*6)Major Arc:An arc of a circle having length greater than the semi circle is called major arc. The degree measure of major arc is greater than 180 but less than 360.*

*7)Segment:The area of a circle bounded by a cord and corresponding arc is called segment of the circle.*

*8)Minor Segment:The area of circle bounded by the cord and minor arc is called minor segment.*

*9)Major Segment:The area of circle bounded by the cord and major arc is known as major segment.*

*10)Sector:The area of circle bounded by two radii and the corresponding arc is called sector of the circle.*

*11)Minor Sector:The area bounded by two radii and the corresponding minor arc is known as minor sector.*

*12)Major Sector: the area bounded by two radii and the corresponding major arc is known as major sector.*

*13)Secant Of a Circle:A line which intersects a circle into two points having either one end or both the ends outside the circle is called secant of a circle.*

*NOTE:A circle divides the plane on which it is drawn in three parts i.e interior, exterior and circumference.*

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