.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
OThe distance from centre to any point on thecircle is called radius of the circle.ARADIUS = OARadius
.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
.OThe length of the circle or the distancearound it is called circumference of thecircle.
.OA BA Line segment whose both the ends touchesthe circumference and passes through thecentre is called diameter.DIAMETER : AB
Relation between radius anddiameter.OA BRADIUS = DIAMETER2OB = AB2
Eg. If diameter of the circle is 10 cm then findits radius?.ODiameter = 10cmSol. Radius =diameter / 2radius=10 cm/ 2radius =5 cmA B
.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
RELATION BETWEEN CIRCUMFERENCE ANDDIAMETER.ODIAMETERCIRCUMFERENCE = 3 x DIAMETER(APPROX)A B
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
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 ______.
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