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Circle - Wikipedia A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre The distance between any point of the circle and the centre is called the radius The length of a line segment connecting two points on the circle and passing through the centre is called the diameter
Circle - Math is Fun A circle has about 80% of the area of a similar-width square The actual value is (π 4) = 0 785398 = 78 5398 % And something interesting for you to try: Circle Area by Lines Names Because people have studied circles for thousands of years special names have come about
Circles | Brilliant Math Science Wiki Arc length of a circle is the length of the curved part Arc length of a full circle is its circumference, but what about the arc length of sectors (pieces of circles)? They are calculated by a formula \(S=r\theta,\) where \(S\) is the arc length, \(r\) is the radius of the circle, and \(\theta\) is the angle of the sector