When the receding lines are true length, and the projectors are at 45 degrees to the plane of projection, the oblique drawing is called this:

In an oblique drawing, equally spaced partial circles may be used to show this:

Oblique drawings are dimensioned in a similar fashion as these types of drawings:

In a CAD system, you can draw an ellipse by specifying these:

In oblique projection, important shapes should be in this position relative to the viewing plane: