# the Circle by VBr1k2g

VIEWS: 0 PAGES: 15

• pg 1
```									The Circle
By Ranjana
O            A

CIRCLE
Eg. ball,bangle,lemon.coin
CENTRE
O
B                        A

CENTRE : O
.
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                A

The distance from centre to any point on the
circle is called radius of the circle.

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
2

A        .
O
B

OB = AB
2
Eg. If diameter of the circle is 10 cm then find

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
.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?
2. What is the relation between circumference and diameter
of the circle?
Sol. Circumference=3Xdiameter(approx)

3. In this figure
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.

```
To top