The Circle By Ranjana O A CIRCLE Eg. ball,bangle,lemon.coin CENTRE O B A RADIUS CENTRE : O RADIUS : OA . O In a plane,each point of the circle is at equal distance from a fixed point.The fixed point is called the centre of the circle. CENTRE = O Radius O A The distance from centre to any point on the circle is called radius of the circle. RADIUS = OA A D I A . O M E T E R B A Line segment passing through the centre of the circle and whose end points lie on the circle is called the diameter of the circle. DIAMETER = AB . O The length of the circle or the distance around it is called circumference of the circle. A . O B A Line segment whose both the ends touches the circumference and passes through the centre is called diameter. DIAMETER : AB Relation between radius and diameter RADIUS = DIAMETER 2 A . O B OB = AB 2 Eg. If diameter of the circle is 10 cm then find its radius? Sol. Radius =diameter / 2 radius=10 cm/ 2 radius =5 cm A . O Diameter = 10cm B Eg. If radius of the circle is 6 cm,then find the diameter of the circle? Sol. Diameter = 2 x Radius Diameter = 2 x 6cm Diameter = 12 cm A Radius = 6cm .O RELATION BETWEEN CIRCUMFERENCE AND DIAMETER CIRCUMFERENCE = 3 x DIAMETER(APPROX) A . O DIAMETER B Eg. Find the circumference (approx) of the circle whose diameter is 10cm. Sol. Circumference = 3 x diameter(approx) Circumference = 3 x 10 cm Circumference = 30 cm A . O B DIAMETER=10 CM EVALUATION 1. what is the relation between radius and diameter of the circle? Sol .Radius=diameter/2 2. What is the relation between circumference and diameter of the circle? Sol. Circumference=3Xdiameter(approx) 3. In this figure radius OA or OB is ______. A . O B diameter AB is ________. centre O is _________. This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.
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