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The Circle By Ranjana. O. A. CIRCLE. Eg. ball,bangle,lemon.coin. CENTRE. O. A. B. 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.

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Presentation Transcript
slide1

The Circle

By Ranjana

slide2

O

A

CIRCLE

Eg. ball,bangle,lemon.coin

slide3

CENTRE

O

A

B

RADIUS

CENTRE : O

RADIUS : OA

slide4

.

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

slide5

Radius

O

A

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

RADIUS = OA

slide6

A

DI AMETER

.

O

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

slide7

CIRCUMFERENCE

.

O

The length of the circle or the distance around it is called circumference of the circle.

slide8

.

O

A

B

A Line segment whose both the ends touches the circumference and passes through the centre is called diameter.

DIAMETER : AB

slide9

Relation between radius and diameter

RADIUS = DIAMETER

2

.

O

A

B

OB = AB

2

eg if diameter of the circle is 10 cm then find its radius
Eg. If diameter of the circle is 10 cm then find its radius?

Sol. Radius =diameter / 2 radius=10 cm/ 2 radius =5 cm

.

O

A

B

Diameter =10cm

slide11

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

.

Radius = 6cm

A

O

slide12

RELATION BETWEEN CIRCUMFERENCE AND DIAMETER

CIRCUMFERENCE = 3 x DIAMETER(APPROX)

CIRCUMFERENCE

.

O

B

A

DIAMETER

slide13

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

CIRCUMFERENCE

.

O

B

A

DIAMETER=10 CM

slide14

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

O

radius

OA or OB is ______.

A

B

diameter

AB is ________.

centre

O is _________.

slide15

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