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" At a point 200 feet from, and on a level with the base of a tower, the angle of elevation of the top of the tower is observed to be 60° : what is the height of the tower? "
Elements of Plane Trigonometry: And Their Application to the Measurement of ... - Página 66
por William Frothingham Bradbury - 1864
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An Elementary Geometry and Trigonometry

William Frothingham Bradbury - 1872 - 238 páginas
...When a tree 25 feet high casts a shadow 100 feet long, what is the sun's altitude ? Aus. 14° 2' 10". 7. From the base of a tower, the angle of elevation...horizontal plane, what is the height of the second? Ans. 134.05 fI. 8. In the ruins of Persepolis there stand two upright columns, one 64, the other 50...
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A treatise on elementary trigonometry. [With] Key, by H. Carr

John Bascombe Lock - 1882
...observed to be 45°. What is the height of the column 1 (2) At a point 200 feet from, and on a level with the base of a tower, the angle of elevation of the top of the tower is observed to be 60° : what is the height of the tower? (3) From the top of a vertical...
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A Treatise on Elementary Trigonometry

John Bascombe Lock - 1885 - 274 páginas
...observed to be 45°. "What is the height of the column ? (2) At a point 200 feet from, and on a level with the base of a tower, the angle of elevation of the top of the tower is observed to be CO0 : what is the height of the tower? (3) From the top of a vertical...
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Elementary Trigonometry

Henry Sinclair Hall, Samuel Ratcliffe Knight - 1893 - 404 páginas
...of 27° 2' to the horizon : find their heights, given tan 27° 2' = -51. Example II. From the foot of a tower the angle of elevation of the top of a column ia 60°, and from the top of the tower, which is 50ft. high, the angle of elevation is 30°:...
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Trigonometry for Beginners

John Bascombe Lock - 1896 - 147 páginas
...observed to be 45* ; what is the height of the column ? 2. At a point 200 feet from, and on a level with the base of a tower, the angle of elevation of the top of the tower is observed to be 00* ; what is the height of the tower Ч 9. From the top of ^a vertical...
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Calendar, for the Year ...

1897
...the similar and similarly described figures on the sides containing the right angle. 6. From the foot of a tower the angle of elevation of the top of a column is 60°, and from the top of the tower, which is 30 feet high, the augie of elevation is 30";...
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Elements of Trigonometry: Plane and Spherical

Andrew Wheeler Phillips, Wendell Melville Strong - 1898 - 138 páginas
...angle of depression of P if O is the point of observation. (1t.) At a hori2ontal distance of 253 ft. from the base of a tower the angle of elevation of the top is 60° 20'; find the height of the tower. (12.) From the top of a vertical cliff 85 ft. high the angle...
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Elements of Trigonometry

Herbert Coleman Whitaker - 1898 - 182 páginas
...160 feet from the foot of the tower. Find the height of the tower. 149. At a distance of 296 feet (a) from the base of a tower, the angle of elevation of the top is three times as great as the angle of elevation seen from a point 208 feet (6) nearer the base. Find...
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Plane Trigonometry for Colleges and Secondary Schools

Daniel Alexander Murray - 1899
...examples are given here ; others will be given later. JL. At a point 150 ft. from, and on a level with, the base of a tower, the angle of elevation of the top of the tower is observed to be 60°. Find the height of the tower. Let AB be the tower, and P the point...
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THE ELEMENTS OF PLANE AND SPHERICAL TRIGONOMETRY

THOMAS U. TAYLOR, CHARLES PURYEAR - 1902
...angle of 46° 24'. Find the side of the inscribed square. Ans. 28.72 inches. 15. At a point 50 feet from the base of a tower the angle of elevation of the top was found, by the use of a transit, to be 68° 18'. If the height of the instrument was 4.75 feet,...
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