Higher geometry; an introduction to advanced methods in analytic geometry (1922)
Woods, Frederick S. (Frederick Shenstone), 1864- · Boston, New York, Ginn and Company · leaf 57
ormed byn points, no three of which lieon a straight line, togetherwith the \n(n— 1) straightlines joining these points. Acomplete three-point is there-fore a triangle consisting ofthree vertices and three sides.A complete four-point is calleda complete quadrangle andconsists of four vertices… … Fig. 11 POINT AND LINE COORDINATES IN A PLANE 45 The point of intersection of two opposite sides is a diagonalpoint. The complete quadrangle has three diagonal points. It is obvious that a complete n-point and a complete «-line aredualistic. A triangle is dualistic to a triangle, and a…
Geometry, Analytic
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