Measuring Distance of Polygon

Discussion created by mark.picazo on Dec 2, 2013
Latest reply on Dec 5, 2013 by btfou
Hi, I am Mark and I am new with GIS software development.

My question is can I use the Measurement Tool to measure the radius/diameter of a Circle Polygon? Because currently it does not give an accurate result, say 1 mi is equals 0.8 mi only

Or do I use the Area and Length for a polygon? I have read something regarding planar, geodesic, etc, and using the right projection, not sure how this affects the accuracy of the measurement.