| 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... | |
| 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... | |
| 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... | |
| 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°:... | |
| 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... | |
| 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";... | |
| 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... | |
| 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... | |
| 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... | |
| 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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