gles atA are by hypothesis each of them a right angle; the angleBAC is not in general a right angle, and it may be shownthat the condition of its being so, is that the normals BB\A A shall intersect, or that the normals CG\ AA^ shallintersect, for it can be shown that if one pair intersect,… … 477. Take x^ ?/, z for the coordinates of the point A] a, ^8, 7for the direction-cosines of AA^ a^, )5^, 7^ for those of AB^and a^, ySg, 72 for those of A C, Write also Then it will be shown that the condition for the intersectionof the normals AA^ BB is the condition for the intersection of the…
Geometry, Analytic · Surfaces
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