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A circle is the locus of a point which moves in a plane in such a way that its distance from a fixed point remains constant.
A line, which intersects a circle in two distinct points, is called a secant.
A line meeting a circle only in one point is called a tangent to the circle at that point.
The point at which the tangent line meets the circle is called the point of contact.
The length of the line segment of the tangent between a given point and the given point of contact with the circle is called the length of the tangent from the point to the circle.
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