orthographic projection

here comes something that are really related to the course that I am taking now .orthorgraphic project represents a 3 dimensional from or construction by projecting lines perpendicular to the picture plane.

we have been taught about what's plan view,elevation ,side views and section .

orthographic projection:

1)projections are parallel to each other and perpendicular to the picture plane.

2)axonometric projections is a special case of orthographic projection .

oblique projection 

1)projection are parallel to each other and oblique to the picture plane .

perspective projection 

1)projections or sightnes radiate from a central point that represents single eur of the observer.