1. The purpose of construction lines are to preserve dimensions across different views. The purpose of object lines are to define the shapes of objects and to reveal hidden portions of the object.
2. Hidden lines and center lines help reveal hidden aspects and proportions of an object in a particular view, and give the object in question depth.
3. The view shown in number 2 was a perspective view, as all the lines converged into a single vanishing point.
4. The view shown in number 6 is an isometric drawing. All the angles shown are 45 degrees.
5. Multi-view drawings enable quick and easy construction. Pictorial drawings often have details missing or distorted. With a multi-view drawing, objects are flat, detailed, and in proportion across multiple views.
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