Art of Problem Solving

Externally tangent: Difference between revisions

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#redirect [[Tangent line]]
Two [[smooth]] [[closed curve]]s are said to be '''externally tangent''' if they are tangent and each lies on the exterior of the other.  Equivalently, they [[intersect]] at a [[point]] <math>P</math>, at this point they have a common [[tangent line]], and locally they lie on different sides of this line.
 
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Latest revision as of 14:38, 28 April 2007

Two smooth closed curves are said to be externally tangent if they are tangent and each lies on the exterior of the other. Equivalently, they intersect at a point $P$, at this point they have a common tangent line, and locally they lie on different sides of this line.

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