The Isometric Snap/Grid mode helps you create 2D images that represent 3D objects.
By setting the Isometric Snap/Grid, you can easily align objects along one of three isometric planes; however, although the isometric drawing appears to be 3D, it is actually a 2D representation. Therefore, you cannot expect accurate results with such capabilities as extracting 3D distances and areas or displaying objects from different viewpoints.
Setting Isometric Snap and Grid
Drawing Isometric Circles