A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 25
point starting fromA and coming around to A again, so that B and Acoincide. This line may be designated as theline AmnA, or A7?i?iB. In the fourth case, thereare three lines represented, which are designated,respectively, as AwiB, A;iB, and Ac3; or, thelast, as AB. 15. Lines are of Two Kiiuls,… … 17. A Curved Line is a line traced by a point which con-stantly changes its direction of motion. Ills.—Thus in 1, Fig. 4, if the line AB is conceived as traced by a pointmoving from A to B, it is evident that this point moves in the same directionthroughout its course; hence AB is a straight line.…
Geometry · Trigonometry
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