Why does not equal computing line in `OpenLayers` with `ArcGIS`?

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My map projection is: "EPSG:900913" ,Display projection is "EPSG:4326" and units is "m", however does not equal the length is calculated in OpenLayers with ArcGIS, in fact Openlayers show the length more than the actual length.

For example:

the calculation length in ArcGIS is: 100m and in OpenLayers is: 120m. How to resolve this problem? Can anyone help me?



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