Tangent are the line that touches the circle straightly, the pt. at which it touches the circle is called Pt. of Contact.

We can draw many circles... but from a exterior pt. we can draw only 2 tangents.
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A tangent is a straight line that intersects a circle or curved surface at one point. For a circle, there a infinite number of tangents that can be drawn but from an external point only two tangents can be drawn. Please refer the diagram.

Hope that helps !!
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