According to Planck's Law, it is impossible to create a perfect circle (2D plane), let alone a perfect sphere (3D plane). Planck's measurement is 10^-44Hz (sine curve), or the distance light travels in a second. Also, the value of Pi forbids any perfect measurement for the circumference, because the value never ends, no matter how close you get.
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If you're talking about a perfect circle and perfect squares, I would say probably about 3.1415926 squares would fit into a circle. So, about 3: but a little more. - Josh
They're called protractors.
Because pi is a constant. It is the ratio between the circumference and diameter of any circle (assuming it is a perfect circle).
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circle and rectangle. circle for the top and a curled rectangle with length equal to the circumference of the circle for the side.