Do we need to use \setlength if we use the geometry package? Does the \setlength have any feature not found in geometry package ؟

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    This depends what for. This command can be used in a lot of contexts which are not necessarily about the page layout. – Bernard Sep 20 at 15:53
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    you question can't have an answer the two things are more or less completely unrelated. \setlength is a core latex command that sets a length register to a value. geometry is a package that knows about page sizes like A4 and page layout concepts like two-column, and allows lengths to be specified that don't correspond to length registers, such as margins – David Carlisle Sep 20 at 16:05

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