mportance, or are not taken accountof. 264 Geometry. In like manner a quadrilateral becomes a system offour infinite straight lines, with their six points ofintersection, since the four lines, taken two and two,meet in six points. Hence we have the following: Definition. A system of four infinite… … Thus AB, BC, CD, DA are the sides; and A, B, C, D, E, Fare the vertices. Two vertices which do not lie on the same side arecalled opposite vertices. Tlius B and F lie on the same side with A; so alsodo D and E; C, however, does not; hence C is thevertex opposite to A. In like manner B and D…
Geometry · Geometry, Plane
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