An isometric drawing is a three dimensional drawing in which the horizontal edges of a object are drawn usually at a 30 degree angle and all verticals projected perpendicularly from a horizontal base,all lines being drawn to scale.
Source:Dictionary.com
An orthographic drawing is a two-dimensional graphic representation of an object in which the projecting lines are at right angles to the plane of the projection.
Source:Dictionary.com
An oblique drawing is a drawing of the face of a 3-dimensional object,usually parallel to the picture planes,is represented in accurate or exact proportion and all other faces are shown at any other convenient angle other than 90 degrees.
Source:Dictionary.com
drawings from top to bottom:isometric,orthographic and oblique
Source of pictures:www.thinkquest.com and www.cdli.ca
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