To Construct an Arc Interpolation by Selecting an Element
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Select the Interpolation by Arcs tool ( split button).
![](GUID-15FF0D77-059A-5FD9-2327-A20A2185CE22-low.png)
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In the tool settings window, set Input By to Picking Linestring.
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Select a line string or shape from which to construct the interpolation.
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Enter a data point to accept the construction.