An opinion about circle

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I'm a student with little knowledge, but I have an opinion about circles which I'd be happy to discuss here. I believe that a circle is a polygon with an enormous number of sides (which I consider as a straight line) and my proof of that is a circle as a 2D shape is a repeat of 1D shapes which are straight lines, like any 2D shape. Also I believe that there is no perfect circle; there are regular polygons considered as circles. And my proof is in our real life if we took any circle and magnified it we'll find straight lines, or if we looked at a circular motion using a femtosecond camera for example, we'll find motions in straight lines. I've tried to calculate the value of pi by considering the circle as a regular polygon and, I've got the same value of rounded pi on my calculator. Can any one prove I am wrong or right or discuss me? Thanks in advance

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Whether a perfect circle can exist in real life has no bearing on the mathematics. A circle in mathematics is an abstract concept, not something related to the real/physical world.

You're right that you can approximate the value of $\pi$ by considering regular polygons. In fact, this is what Archimedes did a long time ago. But no matter how many sides you use, it's never going to be a perfect circle. And you need an increasingly large amount of sides of the polygon, as you increase the desired precision of the approximation.

However, you could probably view the circle as the limit of regular $n$-gons ( this limit is not a polygon itself, though).