In today session we are going to discuss how to find the area of circle. The area of circle can be obtain by the following ways.
1: If we know the radius of the circle then the area of 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
2: We can also understand how to make a pie chart by using circle. If we know the diameter d of the circle. If diameter d is given then the area of 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
3: Now the circumference of the circle, if circumference c is given then the area of 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 we 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
The questions on how to make pie chart and area of circle can be asked in icse question papers 2013 and In the next session we will discuss about parts of a circle.(want to Learn more about area of circle, click here),
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