An elementary treatise on analytical geometry : embracing plane co-ordinate geometry, and an introduction to geometry of three dimensions (1869)
Johnson, William Woolsey, 1841-1927 · Philadelphia : J.B. Lippincott · leaf 31
line, other-wise it will not be what we are seeking—namely, a general formulafor the straight line. 30. But, first let us con-sider a particular class ofstraight lines—namely, thosewhich pass through the ori-gin. Draw such a line, andthe ordinates of several ofits points. The trianglesPRO thus… … The value of the constant ratio, 26 determines the direction of the THE STRAIGHT LINE. 27 line, it is therefore called the direction ratio. In the figure, m ispositive, for the co-ordinates x and y are either both positive orboth negative, so that their quotient is always positive. If the line had…
Geometry, Analytic
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