 | Richard Dunkley Beasley - 1858 - 144 стор.
...observation is ^r feet from the foot of the tower. 7. Construct the angle whose tangent is V5 — 1. 8. At the foot of a mountain the elevation of its summit is 45°. After ascending 1 mile up a slope of 30° its elevation is In i^ -j found to be 60°. The height... | |
 | Walter Haweis James - 1881 - 116 стор.
...your paper and apcuracy of result. Heights and distances found are to be figured on the diagram. 39. At the foot of a mountain, the elevation of its summit...towards the summit, its elevation is found to be 60°. Determine height pf mountain. 40. A person standing on the bank of a river observes the elevation of... | |
 | Edward Albert Bowser - 1892 - 194 стор.
...tower 108 feet high are 30° and 00° respectively : find the height of the column. Ans. 72 feet. 75. At the foot of a mountain the elevation of its summit...found to be 60° : find the height of the mountain. Ans. — — -— miles. V2 76. From the top of a cliff the angles of depression of the top and bottom... | |
 | Edward Albert Bowser - 1892 - 392 стор.
...tower 108 feet high are 30° and 60° respectively: find the height of the column. Ans. 72 feet. 112. At the foot of a mountain the elevation of its summit...found to be 60° : find the height of the mountain. Ans. ^ +- miles. V2 113. A and B are two stations on a hillside. The inclination of the hill to the... | |
 | Edward Albert Bowser - 1894 - 206 стор.
...tower 108 feet high are 30° and 60° respectively : find the height of the column. Ans. 72 feet. 75. At the foot of a mountain the elevation of its summit...elevation is found to be 60° : find the height of the 1nguntain. £У } 3n, 2/Lh! miles. ~ 3 - \ V2 76. From the top of a cliff the angles of depression... | |
 | Edward Albert Bowser - 1892 - 202 стор.
...tower 108 feet high are 30° and 60° respectively: find the height of the column. Ans. 72 feet. 70. At the foot of a mountain the elevation of its summit...45°. After ascending for one mile, at a slope of l5°, towards the summit, its elevation is found to be 60° : find the height of the mountain. Ans.... | |
 | Sidney Luxton Loney - 1893 - 534 стор.
...45°; find the height of the tower and its horizontal distance from the points of observation. 12. At the foot of a mountain the elevation of its summit is found to be 45°; after ascending one mile up a slope of 30° inclination the elevation is found to be 60°. Find the height of the mountain.... | |
 | British Columbia. Superintendent of Education - 1893 - 812 стор.
...shore 150 feet from the base of the cliff' is observed to be 30°; find the height of the cliff. 8. At the foot of a mountain the elevation of its summit...towards the summit its elevation is found to be 60°. Determine the height of the mountain. 9. From each of two ships a mile apart the angle is observed... | |
 | 280 стор.
...respectively 75°, 30°, 45°, and 90°; find how far P is from Q and how far each is from A and B. 16. At the foot of a mountain the elevation of its summit is found to be 45°; after ascending one mile up a slope of 30° inclination the elevation is found to be 60°. Find the height of the mountain.... | |
 | 646 стор.
...elevation to be 30°, Calculate (i) the width of the river and (ii) the height of the tree. [ICSE 2003] 42. At the foot of a mountain, the elevation of its Summit is 45°. After ascending 500 m towards the mountain up an incline of 30°, the elevation changes to 60°.... | |
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At the foot of a mountain the elevation of its summit is found to be 45°. After ascending for one mile, at a slope of 15°, towards the summit, its elevation is found to be 60° : find the height of the mountain. 