tangent - a line in the plane of a circle that intersects the circle at exactly one point., secant - a line that contains a chord, diameter - a chord which passes through the center of the circle. It passes through the center of a circle. It is twice the length of a radius., chord - a segment whose endpoints are any of two different points in the circle., radius - a segment whose one endpoint is in the center of the circle and the other endpoint is any point on the circle, arc - a part or a portion of a circle,

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