Area of circle, derive the formula..

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To find out the formula of a circle

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By- MK Prince :

By- MK Prince Area of of circle

Centre of a Circle:

Centre of a Circle centre O

Other Parts of a Circle:

Other Parts of a Circle diameter radius A B O C

Take a cut out of a circle:

Take a cut out of a circle W e'll start with the circle that we want to break up: r Circumference = 2 r

Divide the circle into 16 parts as below:

Divide the circle into 16 parts as below

16 parts will look like below :

16 parts will look like below :

Arrange all 16 parts as like below:

Arrange all 16 parts as like below r r r r We get the shape of nearly a rectangle.

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r r r r Area of circle = area of rectangle = length X Breadth = r X r = r 2

Practice Q-Find the area of a circle of radius 7 cm:

Practice Q-Find the area of a circle of radius 7 cm A = r 2 A = (7) 2 A = (22/7) X 49 cm 2 =154 cm 2 R= 7 cm

Home Work Q1. Find the area of the circle whose radius is 1 cm. Q2. Find the area of the circle whose diameter is 1 cm. :

Home Work Q1. Find the area of the circle whose radius is 1 cm. Q2. Find the area of the circle whose diameter is 1 cm.

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