Circle area calculation in QGIS is inaccurate

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I created a circle with a radius of 3 km, calculated the area using field calculator and got a different result from real area.

The QGIS result is 28273078.8 while manually calculated area is 28274333.9 which is also the same number I got when I calculated the area in ArcMap.

"On the fly" projection is disabled and project CRS is set to utm32

Any ideas what is causing this, how to get more accurate area calculations?



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