 | William Frothingham Bradbury - 1872 - 262 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... | |
 | John Bascombe Lock - 1882 - 378 páginas
...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... | |
 | John Bascombe Lock - 1885 - 368 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... | |
 | Henry Sinclair Hall, Samuel Ratcliffe Knight - 1893 - 434 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°:... | |
 | John Bascombe Lock - 1896 - 244 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... | |
 | 1897 - 154 páginas
...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";... | |
 | Andrew Wheeler Phillips, Wendell Melville Strong - 1898 - 362 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... | |
 | Herbert Coleman Whitaker - 1898 - 216 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... | |
 | Daniel Alexander Murray - 1899 - 226 páginas
...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... | |
 | Thomas Ulvan Taylor, Charles Puryear - 1902 - 242 páginas
...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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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? 
