Tangent Lines To Circles
In Euclidean plane geometry, a tangent line to a circle is roughly a line through a pair of infinitely close points on the circle. Tangent lines to circles form the subject of several theorems, and play an important role in many geometrical constructions and proofs. Since the tangent line to a circle at a point P is perpendicular to the radius to that point, theorems involving tangent lines often involve radial lines and orthogonal circles.
Read more about Tangent Lines To Circles: Tangent Lines To One Circle, Tangent Lines To Two Circles, Tangent Lines To Three Circles: Monge's Theorem, Tangent Lines and Billiards, Problem of Apollonius, Generalizations
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