The Circle By Ranjana

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# The Circle By Ranjana - PowerPoint PPT Presentation

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

The Circle

By Ranjana

O

A

CIRCLE

Eg. ball,bangle,lemon.coin

CENTRE

O

A

B

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

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

CIRCUMFERENCE

.

O

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

.

O

A

B

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

DIAMETER : AB

2

.

O

A

B

OB = AB

2

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

.

O

A

B

Diameter =10cm

Sol. Diameter = 2 x Radius

Diameter = 2 x 6cm

Diameter = 12 cm

.

A

O

RELATION BETWEEN CIRCUMFERENCE AND DIAMETER

CIRCUMFERENCE = 3 x DIAMETER(APPROX)

CIRCUMFERENCE

.

O

B

A

DIAMETER

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

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

O

OA or OB is ______.

A

B

diameter

AB is ________.

centre

O is _________.

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