 | John Bascombe Lock - 1882 - 378 páginas
...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 cliff, the angle of depression of... | |
 | John Bascombe Lock - 1885 - 368 páginas
...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 cliff, the angle of depression... | |
 | John Maximilian Dyer - 1891 - 306 páginas
...and at an angle 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... | |
 | Edward Albert Bowser - 1894 - 206 páginas
...c= 9. 375. 28.4771. '.'.: .• HEIGHTS AND DISTANCES. 57. At a point 200 feet in a horizontal line from the foot of a tower, the angle of elevation of...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 of a point on the... | |
 | Edward Albert Bowser - 1892 - 392 páginas
...is a furlong. 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... | |
 | John Bascombe Lock - 1892 - 354 páginas
...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 60° : what is the height of the tower? (3) From the top of a vertical cliff, the angle of depression of... | |
 | Henry Sinclair Hall, Samuel Ratcliffe Knight - 1893 - 434 páginas
...elevation of the sun when the shadow of a pole 6 feet high is 2x/3 feet long. 4. At a distance 86'6 feet from the foot of a tower the angle of elevation of the top is 30°. Find the height of the tower and the observer's distance from the top. 5. A ladder 45 feet... | |
 | George Albert Wentworth - 1894 - 196 páginas
...and 30°. 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... | |
 | 1897 - 154 páginas
...is equal to 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... | |
 | Herbert Coleman Whitaker - 1898 - 216 páginas
...6. Arc sin 27^— arc sin N^/3 = arc sin N. Find N. PROBLEMS IN GONIOMETRY. 148. At a distance of 70 feet from the foot of a tower, the angle of elevation of the top is 21° greater than the angle of elevation seen at a distance of 160 feet from the foot of the tower.... | |
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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? 
