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- 1. The CircleBy Ranjana
- 2. O ACIRCLEEg. ball,bangle,lemon.coin
- 3. OACENTRE : ORADIUS : OABCENTRERADIUS
- 4. .OIn a plane,each point of the circle is at equaldistance from a fixed point.The fixed point iscalled the centre of the circle.CENTRE = O
- 5. OThe distance from centre to any point on thecircle is called radius of the circle.ARADIUS = OARadius
- 6. .ODIAMETERA Line segment passing through the centre ofthe circle and whose end points lie on the circleis called the diameter of the circle.ABDIAMETER = AB
- 7. .OThe length of the circle or the distancearound it is called circumference of thecircle.
- 8. .OA BA Line segment whose both the ends touchesthe circumference and passes through thecentre is called diameter.DIAMETER : AB
- 9. Relation between radius anddiameter.OA BRADIUS = DIAMETER2OB = AB2
- 10. Eg. If diameter of the circle is 10 cm then findits radius?.ODiameter = 10cmSol. Radius =diameter / 2radius=10 cm/ 2radius =5 cmA B
- 11. .OEg. If radius of the circle is 6 cm,then find thediameter of the circle?Radius = 6cmASol. Diameter = 2 x RadiusDiameter = 2 x 6cmDiameter = 12 cm
- 12. RELATION BETWEEN CIRCUMFERENCE ANDDIAMETER.ODIAMETERCIRCUMFERENCE = 3 x DIAMETER(APPROX)A B
- 13. Eg. Find the circumference (approx) of the circle whosediameter is 10cm..ODIAMETER=10 CMSol. Circumference = 3 xdiameter(approx)Circumference = 3 x 10 cmCircumference = 30 cmAB
- 14. EVALUATION1. what is the relation between radius and diameter of thecircle?.OA B2. What is the relation between circumference and diameterof the circle?3. In this figureSol .Radius=diameter/2Sol. Circumference=3Xdiameter(approx)radiusdiametercentreAB is ________.O is _________.OA or OB is ______.
- 15. This powerpoint was kindly donated towww.worldofteaching.comhttp://www.worldofteaching.com is home to over athousand powerpoints submitted by teachers. This is acompletely free site and requires no registration. Pleasevisit and I hope it will help in your teaching.

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