Area of Circle

How to calculate the area of a circle

If you cut the circles and put them on each other, they gradually become a shape close to the rectangle. At this time, the horizontal length of the rectangle becomes half of the circumference, and the height becomes the radius.
Therefore, the area of the circle can be obtained as the product of half of the circumference and radius.

Area of circle = 1/2 Circumference x Radius
= 3.14 x radius x radius