Question: I am saying this because the area of the circle is pi \* radius \* radius. We know that pi is a never ending value. So, if some one says I need a circle of 3 metre square area to make a rim of the wheel. How can I make so? The value of pi is non-terminating - not a practical value. Also, does it mean that area of a square is finite but area of circle is not finite. But, if area of circle is not finite, then how can I see/visualize it.

Answer: 
A shape that is completely inside of another shape has a smaller area. A circle of radius 1 centered at the origin may be placed inside of a square with corners at (-1,-1), (1,-1), (-1,1), (1,1). The area of such a square is 4, and so the area of the circle must be less than 4.
All space (area) is infinite. Measurements express our understanding of such via finite rounding. That is to say, in measuring we express a point as finite - when in fact a point has an area made up of an infinite number of "points."