how to calculate pitch of a Archimedean Spiral

how to find pitch of a spiral having diameter D And N no. of turns

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The pitch is the length divided by the number of turns.

 
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Aled is correct refering to a Helix

A Helix has length
A Spiral has no length

Pitch for a spiral is "Final diameter" - "Start diameter" divided by "Number of turns"
(FD-SD)/NOT

 
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