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A circle is a simple shape of Euclidean geometry that is the set of all points in a plane that are at a given distance from a given point, the centre. The distance between any of the points and the centre is called the radius. It can also be defined as the locus of a point equidistant from a fixed point.Center A point inside the circle. All points on the circle are equidistant (same distance) from the center point. Radius The radius is the distance from the center to any point on the circle. It is half the diameter. See Radius of a circle. Diameter The distance across the circle. The length of any chord passing through the center. It is twice the radius. See Diameter of a circle. Circumference The circumference is the distance around the circle. See Circumference of a Circle. Area Strictly speaking a circle is a line, and so has no area. What is usually meant is the area of the region enclosed by the circle. See Area enclosed by a circle . Chord A line segment linking any two points on a circle. See Chord definition Tangent A line passing a circle and touching it at just one point. See Tangent definition Secant A line that intersects a circle at two points. See Secant definition
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Properties of a Circle:
i) It has no starting & ending point
ii) Equal chords subtends equal angles at the center of the circle,
iii) Equal chords measure all the same when measured from the center,
iv) The point of contact between a tangent touching its surface and the radius of the circle when added; makes an angle of 90 Degrees.

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