Isometric Drawing is a three-dimensional object represented by a drawing, its horizontal edges are drawn usually at a 30° angle and all verticals projected perpendicularly from a horizontal base, all lines being drawn to scale.
Oblique Drawing is also a three-dimensional object represented by drawing, its face is usually parallel to the picture plane and represented in accurate or exact proportion. While the other faces are shown at any convenient angle other than 90°.
Orthographic Drawing is a three-dimensional object represented by a drawing, it is represented from 6 different views.
The different between the three drawing is that the Isometric drawing has its edges drawn at 30° while the Oblique Drawing has its edges drawn at 90°, both of the drawing just mentioned is represented from 1 view while Orthographic Drawing is represented from 6 different views.
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