Difference between Isometric, Oblique and Orthographic Drawing. :D

Isometric Drawings: They are 3D drawings that shows three sides of a figure which are all in dimensional proportion. For these type of drawings, the angles are not all at 90 degrees. They are in fact drawn 30 degrees from the base line.

Oblique Drawing: An oblique drawing is a 3D drawing with the most distinguished side facing the person that observes it. It is 45 degrees to the horizontal.

Orthographic Drawings: These drawings are views ( front, side, back, etc. ) of and object, but an orthographic view is only one side.

Adapted from: http://www.cdli.ca/depted/g7/ortho.htm , and, http://toolboxes.flexiblelearning.net.au/demosites/series9/905/2_draw/draw_t3/htm/draw3_2_2.htm

Differences:

Isometric drawings are 30degrees from the horizontal line but oblique drawings are 45degrees the the horizontal. Orthographic are drawings that show side of the object. Isometric drawings show three side of the figure all in dimensional proportion but oblique drawings are drawings where the most distinguished side is facing the observer.