Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 105
3. The perpendiculars from the vertices of a triangle to the oppositesides pass tlirough a common point. The equation of the perpendicular through C is aros A — yScos J5 = 0 ;through B, 7 cos C - a cos .1 = 0; througli A, & cos 27 - 7 cos C = 0. riiOPERTIES OF THE STRAIGHT LINE 91 Akt. 50. —…
Geometry, Analytic
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