Plane and solid analytic geometry; an elementary textbook (1905)
Ashton, Charles H. (Charles Hamilton), 1866- · New York, C. Scribner's Sons · leaf 30
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 Avdll 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. Tlie angle between them will always be co,and the generalized form of the law of the cosines(Art. 7) gives P^P^^ = ^/p^K + KP^ + 2 P^K KP^ cos a>, where not only the magnitudes, but also the directionsof the…
Geometry, Analytic
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