Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 219
of the squares of the lines which,join the middle points of the opposite sides. 5. Projection of a given line on a given axis. — It isrequired to find the projection on the axis OX of the lineAB which makes an anode a with the axis. 200 ANALYTIC GEOMETRY OF SPACE [Ch. I, § 6 Through A and B pass… … ACAB = cos a. ence AB = AB COS a Fig. 4. [5] That is, the projection of a line on an axis is equal to thelength of the line multiplied by the cosine of the angle whichthe line makes with the axis. The projection, AB, of a directed line, AB, is evidentlya directed line. If a broken line AB, BC, CD…
Geometry, Analytic
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