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切线长定理:从圆外一点引圆的两条切线,它们的切线长相等.本文就切线长定理在计算和证明中的应用,举几种常见的类型,以供参考.
The tangent length theorem: two tangents drawn from a point outside the circle, and their tangent lengths are equal. In this paper, the application of the tangent length theorem in calculations and proofs is presented in several common types for reference.