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The total length of the input curves: a segment, an arc, or a whole contour's perimeter (line + arc pieces summed).

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• Geometry (any): the curve geometry to measure.

• Length (number): the total length of the input curves (segments + arcs summed), in mm.

Length sums the length of every curve piece in the geometry, so it adapts to what you feed it:

• A segment: the straight distance between its ends.
• An arc: its true arc length (radius x swept angle).
• A whole contour: the summed perimeter of all its line and arc pieces (the closing edge included on a closed contour).

Loose points contribute nothing.

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