what are the uses of descriptive geometry?

Question

seriuosly

Answer 1

It allows an ... object to be drawn in such a way that it may be 3-D modeled [in a 2-D space, like on a computer screen].

All geometric aspects of the imaginary object are accounted for in true size/to-scale and shape, and can be imaged as seen from any position in space. All images are represented on a two-dimensional drawing surface.