How to Find The Area of a Circle

In today session we are going to discuss how to find the area of circle. The area of circle can be obtained by the following ways.
1: If we know the radius of the circle.
If the radius r is given then the area of the circle can be calculated by the using the method
   Area of circle = pi*r²
Where r is the radius of the circle and (pi) is the constant having fixed value 3.142 or 22/7
We can also understand how to find the area of circle in the CBSE Books for Class 8.
 2: If we know the diameter d of the circle
If diameter d is given then the area of the circle can be calculated by the using the method
     Area of the circle = pi * d²/4
Where d is the diameter of the circle and (pi) is the constant having fixed value 3.142 or 22/7
This topic is also important to find the confidence interval.
3: if we know the circumference of the circle
If circumference c is given then the area of the circle can be calculated by the using the method
             Area of the circle = c²/4*pi
Where c is the circumference of the circle and (pi) is the constant having value 3.142 or 22/7.
At the end of the above method to determine the area of the circle .there is an another way to find the area of the circle
By using the method of area of sector of the circle = (pi*R²*angle) / 360
Where r is the radius of the circle and (pi) is the constant having fixed value 3.142 or 22/7
For the area of whole circle angle must be equal to 360 degree. Therefore the area of the circle will be = (pi*R²*360) / 360 it implies that
Area of the circle = pi*R²