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General arrangement drawings (GA's) present the overall composition of an object such as a building. ... General arrangement drawings are likely to be prepared at each stage of development of a building design, showing the overall relationship between the main elements and key dimensions.

Mechanical drawing, or drafting, is a technique used to represent a three-dimensional object on a two-dimensional piece of drawing paper. Mechanical drawings are a series of two-dimensional views. They give an exact representation of the object and show all parts in their true size relation.

What is a floor plan used for?
Floor plans are scale drawings that show the relationship between rooms, spaces and physical features viewed from above. They provide a way to visualize how people will move through the space.