 | William Frothingham Bradbury - 1864 - 324 páginas
...church ? 6. When a tree 25 feet high casts a shadow 100 feet long, what is the sun's altitude ? 7. From the base of a tower, the angle of elevation of the top of a second tower is 30°, and from the top of the first, which is 175 feet high, the angle of depression... | |
 | William Frothingham Bradbury - 1872 - 262 páginas
...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 of the top of a second tower is 30°, and from the top of the first, which is 175 feet high, the angle of depression... | |
 | John Bascombe Lock - 1882 - 378 páginas
...value of the Trigonometrical Ratios of any required angle. Example 1. At a point 100 feet from the foot of a tower the angle of elevation of the top of the tower is observed to be 60°. Find the height above the point of observation of the top of the tower. TRIGONOMETRY. Let 0 be the... | |
 | John Bascombe Lock - 1885 - 368 páginas
...angle of elevation of the top of the column is observed to be 45°. "What is the height of the column ? (2) At a point 200 feet from, and on a level with...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 cliff, the angle of depression... | |
 | John Maximilian Dyer - 1891 - 306 páginas
...of 45° with the horizontal, what is the height of the kite ? (4) At a point 240 ft. from the foot of a tower the angle of elevation of the top of the tower is 30°, and of the top of its steeple is 45°. Find the height of the steeple. (6) What is .the height... | |
 | John Bascombe Lock - 1892 - 354 páginas
...angle of elevation of the top of the column is observed to be 45°. What is the height of the column ? (2) At a point 200 feet from, and on a level with...to be 60° : what is the height of the tower? (3) From the top of a vertical cliff, the angle of depression of a point on the shore 150 feet from the... | |
 | Edward Albert Bowser - 1892 - 194 páginas
...6=73, с =520. 12480. HEIGHTS AND DISTANCES. 67. At a point 200 feet in a horizontal line from the foot of a tower, the angle of elevation of the top of the tower is observed to be 60° : find the height of the tower. Ans. 346 feet. 58. From the top of a vertical cliff, the angle of depression... | |
 | Edward Albert Bowser - 1892 - 392 páginas
...Show that the field contains 2-J- acres. 92. At a point 200 feet in a horizontal line from the foot of a tower, the angle of elevation of the top of the tower is observed to be 60° : ñnd the height of the tower. Ans. 346 feet. 93. From the top of a vertical cliff, the angle of depression... | |
 | George Albert Wentworth - 1894 - 196 páginas
...Prove that the length of the pole is twice the height of the mound. 26. At a distance (a) from the foot of a tower, the angle of elevation (^) of the top of the tower is the complement of the angle of elevation of a flag-staff on top of it. Show that the length of the... | |
 | John Bascombe Lock - 1896 - 244 páginas
...angle of elevation of the top of the column is observed to be 45* ; what is the height of the column ? 2. At a point 200 feet from, and on a level with the...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 cliff, the angle of depression... | |
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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? 
