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Circles - history and more


I became interested in exploring circles while helping out my niece with some problems involving arcs. So, I am just collecting here some interesting resources found online. 1) Why is a Circle 360 Degrees - Many of us have wrong notion that a circle is just 360 degrees . "A circle has 360 degrees, but it also has 400 gradients and approximately 6.2831853 radians. It all depends on what *units* you measure your angles with." 2) How Egyptian's measured circle's area 3) In this blog, the author says Circles Are the Mother of All Inventions. Really? The author says " A circle is not a “thing-in-itself.” It is a semantic fabrication that exists only in our imagination" 4) The Beauty of Circles and Spheres