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L is a point of a tangency . Segment PL have a common point at P . Find the length of KN

L is a point of a tangency . Segment PL have a common point at P . Find the length-example-1

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\begin{gathered} PK\cdot PN=100 \\ PN=(100)/(8)=12.5 \\ KN=PN-PK=12.5-8=4.5 \end{gathered}

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