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Tangents to a Circle

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A straight line intersects a circle at one or two point. The tangent to a circle is a line that touches the circle at one point. Secant intersects the circle at two points. The point at which the straight line touches the circle is called the point of contact or point of tangency.
Some properties of tangents to a circle are Infinite number of tangents can be drawn to a circle but only one tangent can be drawn at any given point on a circle.  From an external point we can draw two tangents of equal length. The radius of the circle is perpendicular to the tangent at its point of contact and the tangents drawn at the extremities of the diameter of a circle are parallel.

 

secant, secant to a circle, tangent, point of contact, point of tangency, number of tangents, tangent at a given point

radius perpendicular to tangent, radius and tangent, diameter and tangent

 

tangents from external point, external point, tangents to a circle, tangents, tangents of equal length, equality of two tangents, tangents from outside the circle, tangents from outside

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