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In first-angle projection, the projectors originate as if radiated from a viewer's eyeballs and shoot through the 3D object to project a 2D image onto the plane behind it. The 3D object is projected into 2D "paper" space as if you were looking at a radiograph of the object: the top view is under the front view, the right view is at the left of the front view. First-angle projection is the ISO standard and is primarily used in Europe.
An angle of view in an agular extent of a given scene as imaged by a camera.
a right angle is an angle that is 90 degrees
the side of an angle measurement
the angle at which a shadow is formed