Smart, Edward Howard · London : Macmillian and Co. · leaf 46
g3 non-collinear points and joiningthem in all possible ways. (A triangle, but from this aspectwe might call it a 3-corner.)Fig. 7a. A pencil of straight lines passingthrough a point. The figure obtained by taking3 non-concurrent straight linesand making them intersect in allpossible ways. (A… … (da)h IfacJ Fig. 76. The complete quadrangle. Take four points A, B, C, D, no3 of which are collinear. Joining these in pairs we havesix lines called the Sides; the joinsof any two and of the remainingtwo are called Opposite Sides ofthe quadrangle ; thus AB, CD ; BC, AD ; CA, BD, are opposite…
Geometry, Projective
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