Publisher's Synopsis
Excerpt from Notes on Elements of (Analytical) Solid Geometry
The projection of a line on a plane is the line containing the projections of its points on the plane.
When one line or several lines connected together enclose a plane area, the area enclosed by the projection of the lines is called the projection of the first area.
The idea of projection may be in the case of the straight line thus extended: if from the extremities of any limited straight line we draw perpendiculars to a second line, the portion of the latter intercepted between the feet of the perpendiculars is called the projection of the limited line on the second line.
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