A technical drawing is drawn precisely to a scale. Measurements taken from the drawing can be scaled up to produce or build a full size structure or machine, etc.
A freehand drawing could be a simple sketch, detailed drawing, rough doodle, of a subject and is classed as a picture.
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the difrrence is that one starts with an s and the other starts with an oalso they are spelt diffrentlyso does this answer your question Kane
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Centerlines are used to located the center of a hole.