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Is there an equation in which I can convert distance in kilometers into degrees?

I am performing a Kriging analysis and when I am measuring the distance between the input points (for LAG and Major Range), the Measure tool only outputs km/feet/miles, etc. but my data is in WGS84 degrees. So I need to somehow convert these distances into degrees. The points all fall in North America, so they spread from Northern Canada all the way to Central Mexico.

The conversion does not have to be perfect, but it needs to be a good enough ballpark estimate for Kriging.

What I have now is this: LAG = 4,000 km Major Range = 10,600 km

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    Central Mexico to northern Canada is way foo far to use a single conversion value. You should use a geodetic distance function that will calculate a correct value. Related: gis.stackexchange.com/questions/157848/… – Vince Jul 24 at 1:04

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