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Concept

Tangent

A tangent is a line, segment, or ray that intersects a circle at exactly one point. The point is called point of tangency, and the line, segment, or ray is said to be tangent to the circle.

Tangent and Point of Tangency

In the diagram, $A P$ is tangent ray and $\overline{A P}$ is tangent segment. A tangent is always perpendicular to a radius in the circle.

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