T - Commands   
TO_ARCS (command)
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It approximates a polyline converting many small adjacent segments into polyline arcs

 Modify toolbar:  

  Menu : Modify  Polylines operations... Polyline: convert little adjacent segments to arcs

 Command line: TO_ARCS

Select the objects to be converted in arcs, then press Enter to confirm or Esc to delete.... select the objects

Specify if to convert Polylines only [Yes/No] or [Tolerance]: Choose if to convert other linear objects as well and T the maximum acceptable tolerance (through T)
Choosing N it is also possible to convert a spline to polyline arcs

The result of the operation will be displayed

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