Oh, dude, circles were probably invented by some ancient smarty pants who just decided to connect a bunch of points equidistant from a central point. It's like, who really knows, right? But hey, kudos to them for coming up with a shape that's so round and perfect.
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A circle was not invented by anybody. The circle is one of the shapes that appears both naturally and artificially everywhere.
The circle was invented by the mathematician William Jones. He called the symbol for the constant ratio as 'pi,' which is the circumference of a circle divided by its diameter.
Yes. The circles can be of different size. These are called concentric circles.
concentric circles
A cylinder has two circles as its bases.
Tangent circles are circles that touch one another without crossing. The distance between the centres of the circles must be equal to the difference or the sum of their radii.
Well, in math you solve the perimeter of circles and such, and learn understanding of them to help you with circles in real life.