Measure the distance of an arc (line) from point to point?

[junfanbl]

Is there a way to measure the distance of an arc in a pipe? Obviously you can't use the measure tool because it only supplies a straight line. Any other suggestions?

 

[cowski]

If you have the centerline of the pipe, you can use the measure -> length tool. It allows you to select one or more curves and reports the combined length along the curve/combined path.

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