Circle is a shape. We have gotten to know a lot from circles. Because of circles, we get PI, radius, diameter, circumference, and other things. Circles fall into geometry, which is math. We can make many mathematical equations from circles.
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The length of the edge of a circle.
it means it is close
180o is basically a straight angle, if 360 was a circle 180 wiuld be a half circle
radius times two
estimation