Hi tech, why can't you look at the demo version? There is no cost for that, you can just download it from here:
http://moi3d.com/download.htm
There are 2 different demo versions, one is a 30-day trial with full functionality for 30 days which then expires, and there is also a second demo version which does not ever expire but instead has saving disabled.
Running the demo version is the easiest way to see how it works.
For accuracy, basically every drawing command in MoI has input fields where you can specify an exact size directly. So for example when you're drawing a circle when you place the point you can either click it with the mouse (using snaps as well), or you can type in an x,y,z value instead to place it at a specific numeric point. Then in the second step where you're picking the radius for the circle you can again either use the mouse to do it or you can type in a number to fill in the "Radius" edit field with the specific value you want.
When you're entering in points there are various options to do stuff like enter values relative from the last point, or enter in values by angle and distance with polar coordinates instead of x,y,z values, some info on that here:
http://moi3d.com/2.0/docs/moi_command_reference1.htm#__XYZ%20/%20Distance%20/%20Angle
MoI is not the same kind of thing as a "Parametric" CAD system though (if you're thinking of stuff like SolidWorks, Pro/E, etc...), in MoI you usually don't apply accuracy after you have drawn something like you might in a constraint-based system, instead in MoI you usually give it the values that you want at the time you are drawing it.
- Michael
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