Find the length of a Google Earth Path
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Save the path as a *.kmz or *.kml file, and then upload it here with the "Attach File" button! You can upload more than one at a time.
Note that this is not an approximation. The actual length of the arc along the surface of the sphere of the planet is calculated for every pair of coordinates, so if you want to calculate the length of a path that has two consecutive pairs of coordinates that are across the globe from one another, you are safe to do so. That being said, changes in altitude are ignored.