Trigonometry for Beginners: With Numerous Examples
Trigonometry for Beginners: With Numerous Examples
Todhunter, I. (Isaac), 1820-1884
The book Trigonometry for Beginners: With Numerous Examples was written by author Todhunter, I. (Isaac), 1820-1884 Here you can read free online of Trigonometry for Beginners: With Numerous Examples book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Trigonometry for Beginners: With Numerous Examples a good or bad book?
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3 The surface of still water though apparently plane is peally carved ; and it appears from the above calculation ^t an object less than 8 inches above the surface of still Hater will be invisible to an eye on the surface at the distance of a mile. 122. The term angle of depression sometimes occurs in problems of heights and distances : in such cases the spec- tator is supposed to be at a point P above the surface of &e earth, and the angle of depression of any point is the ingle between the st...raight line PC and the line drawn from P to the point, which is somewhere below PC, Shnilarly to a spectator at P the angle of elevation of a point is the angle between PC and the straight line drawn from P to the point which is somewhere above PC, EXAMPLES. XIL Examples. XII. 1. The angles of depression of the top and bottom of a column observed from a tower 108 feet nigh are 30* and 60^ respectively : find the height of the tower. 2. At the foot of a monntain the elevation of its summit is found to be 45*.
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