Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 332
ow. III. Prop. Two lines de-termine the position of a cer-tain point, namely, their pointof intersection. IV. Def. The point of in-tersection of two lines is calledthe junction-point of thelines. V. Prop. Three lines,taken two and two, determineby their intersections threejunction-points. VI. Prop.… … VIII. Prop. On each ofthe four sides of a completequadrilateral lie three ver-tices. VIII. Prop. Througheach of the four vertices of acomplete quadianglethree sides. PRINCIPLE OF DUALITY. 307 IX. Prop. The completequadrilateral has three diago-nals, formed by joining thejunction-point of each…
Geometry, Analytic
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