View
225
Download
1
Category
Preview:
Citation preview
The Circle
By Ranjana
O A
CIRCLEEg. ball,bangle,lemon.coin
OA
CENTRE : O
RADIUS : OA
BCENTRE
RADIUS
.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
O
The distance from centre to any point on the circle is called radius of the circle.
A
RADIUS = OA
Radius
.ODI AMETER
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.
A
B
DIAMETER = AB
.O
The length of the circle or the distance around it is called circumference of the circle.
.OA 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
.OA B
RADIUS = DIAMETER
2
OB = AB
2
Eg. If diameter of the circle is 10 cm then find its radius?
.ODiameter = 10cm
Sol. Radius =diameter / 2 radius=10 cm/ 2 radius =5 cm
A B
.O
Eg. If radius of the circle is 6 cm,then find the diameter of the circle?
Radius = 6cmA
Sol. Diameter = 2 x Radius
Diameter = 2 x 6cm
Diameter = 12 cm
RELATION BETWEEN CIRCUMFERENCE AND DIAMETER
.ODIAMETER
CIRCUMFERENCE = 3 x DIAMETER(APPROX)
A B
Eg. Find the circumference (approx) of the circle whose diameter is 10cm.
.ODIAMETER=10 CM
Sol. Circumference = 3 x diameter(approx)
Circumference = 3 x 10 cm
Circumference = 30 cm
A B
EVALUATION1. what is the relation between radius and diameter of the circle?
.OA B
2. What is the relation between circumference and diameter of the circle?
3. In this figure
Sol .Radius=diameter/2
Sol. Circumference=3Xdiameter(approx)
radius
diametercentre
AB is ________.
O is _________.
OA or OB 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.
Recommended