REM fixed part

echo Filedia 0>> buildGeometries.scr
echo RECTANGLE 0,0 50,30>> buildGeometries.scr
echo CIRCLE 25,15 10>> buildGeometries.scr
echo CONVTOSURFACE ALL>> buildGeometries.scr
echo. >> buildGeometries.scr
echo ACISOUT ALL>> buildGeometries.scr
echo C:\Autodesk\AutoCAD_2019_English_Win_64bit_Trial\geom\test1>> buildGeometries.scr

REM loop Here we create ten circles (nine more) with various radius

setlocal enableDelayedExpansion

for /l %%i in (2,1,6) do (
 	set /a radius = 10+%%i-1
	echo Filedia 1>> buildGeometries.scr
	echo Filedia 0>> buildGeometries.scr
	REM echo ERASE Last>> buildGeometries.scr
	REM echo. >> buildGeometries.scr
	echo CIRCLE 25,15 !radius!>> buildGeometries.scr
	echo CONVTOSURFACE Last>> buildGeometries.scr
	echo. >> buildGeometries.scr
	echo ACISOUT ALL>> buildGeometries.scr
	echo C:\Autodesk\AutoCAD_2019_English_Win_64bit_Trial\geom\test%%i>> buildGeometries.scr
)

endlocal