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Isometric drawing is used in CAD Design. Isometric drawing is a method of designing an object in three dimensions, which you can summarize into two steps: draw the object's height lines vertically, and the width and depth lines in a 30-degree angle to an imaginary horizontal axis. When the drawing is over, it will be like you're watching the object from above at a three-quarter angle. All you need to draw an object using the isometric method is a ruler to keep the object's proportions and a protractor to measure the 30-degree angles.