Plane and solid analytic geometry; an elementary textbook (1901)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's sons · leaf 32
always satisfy himself thatthere is no restriction on their position, and that, if anyother figure is constructed and lettered in a correspond-ing way, just the same demonstration will hold letterfor letter. Ch. II, § 12] THE POINT 13 12. Distance between two points in oblique coordinates. —When… … Fig. 13. Fig. 14. directions will be the same as the positive directions ofthe axes. The angle between them will always be &),and the generalized form of the law of the cosines(Art. 7) gives PXP2 = Vp2JT2 + KPX2 + 2 P2K- KPX cos ft), where not only the magnitudes, but also the directionsof the…
Geometry, Analytic
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