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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 circle has been known since before the beginning of recorded history. Natural circles are common, such as the full moon or a slice of round fruit.
Learn the various meanings and uses of the word circle as a noun and a verb, with synonyms, examples, and word history. See also related phrases and entries for circle.
Learn what a circle is, its parts, formulas, and examples. Find out how to identify, measure, and draw circles and their segments, sectors, and arcs.
Learn about circles, a 2-dimensional closed shape with a curved side and a center. Find out the formulas for area, circumference, arc length, and other circle properties, and see examples and practice problems.
Explore, prove, and apply important properties of circles that have to do with things like arc length, radians, inscribed angles, and tangents.
Learn what a circle is, how to draw it, and how to measure its radius, diameter, circumference and area. Explore the special names and properties of lines, slices and angles related to circles.
Learn the meaning of circle as a shape, a group, or an upper floor in a theater. See how to use circle as a verb, an idiom, or a collocation in different contexts.
