For distance measurements, the distances are computed as distances between projected longitude,latitude coordinates of the points.

Note that the area measurements, geometries drawn are planar geometries and the metrics returned by the measure control are planar measures by default. If your map is in a geographic projection or you have the appropriate projection definitions to transform your geometries into geographic coordinates, you can set the `Use geodesic` property of the control to true to calculate geodesic measures instead of planar measures.