PARTS OF A CIRCLE_CLASS8_angelselciya.pptx

B.ed TNTEU
ANGEL SELCIYA.S
23-EDM-04
LEVEL 1
CLASS 8

1. PARTS OF A CIRCLE BY ANGEL SELCIYA. S 23-EDM-04

2. CIRCLE A circle is the path traced by a moving point so that its distance from a fixed point is always constant .

3. CENTRE AND RADIUS The fixed point of the circle is called its ‘ centre ’ and the constant distance is called its ‘ radius ’.

4. CHORD If any two points on a circle are joined by a line segment, then the line segment is called a ‘chord’ A chord divides a circle into two parts.

5. DIAMETER A chord which passes through the centre of a circle is called as a ‘diameter’.

6. A diameter of a circle divides it into two equal parts. It is also the ‘longest chord’ of a circle.

7. CIRCULAR ARC AND SECTOR

8. Here, arc is the smaller one and arc is the larger one. Each of the parts of the pizza represents the circular sectors. Here is the minor sector and is the major sector.  

9. CIRCULAR ARC A part of the circumference of a circle is called a circular arc

10. SECTOR The plane surface that is enclosed between two radii and the circular arc of a circle is called a sector.

11. SEGMENT Each part of a circle which is divided by a chord is called a segment.

12. MINOR AND MAJOR SEGMENT The part which has a smaller arc is called as the ‘minor segment’ and the part which has a larger arc is called as the ‘major segment’

13. CENTRAL ANGLE The angle formed by a sector of a circle at its centre is called the central angle. The vertex of the central angle of the sector is the centre of the circle. The two arms of it are the radii.

14. The central angle of a circle is . If a circle is divided into ‘ ’ equal sectors, the central angle of each of the sectors is .  

15. The central angle of a semicircle  

16. The central angle of a quadrant of a circle