Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 249
lengths AB\ BC, CD, etc., these separate lengthsbeing considered j^ositive when taken m one direction, 7iegativewhen taken in the oppodte direction, and will be expressedby the equation AH = AB cos a-{- BC cos /3-\- CD cos y + etc. 209. Co-ordinate Axes and Flaiies in Space. The positionof a point… … The point in which the axes intersect is called the originof co-ordinates, or simply the origin. The three axes are designated by the letters JT, Y and Zrespectively. The co-ordinate axes, taken two and two, lie in three planes,one containing the two axes X and Y, another l^and Z, athird Z and X.…
Geometry, Analytic
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