To find the area of a circle, there is a formula to do the task. This formula is established by slicing a circle and arranging the slices to make a rectangle. Consider we have a circle with radius "r" as shown below in the diagram and we want to find its area.
Now let's slice this circle into two semi-circles and then keep slicing it until we get 16 slices of this circle.
Next step is to pick these slices and rearrange them to make a rectangle as shown below:
Hence the formula for area of a circle with radius "r" is established as explained in this presentation.
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