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" ... angle of depression of the line of sight ? In the figure the height of the mountain is necessarily exaggerated. The angle is so small that the result can be found by five-place tables only between two limits which differ by 3' 40". 53. At a horizontal... "
Plane Trigonometry - Page 41
by Levi Leonard Conant - 1909 - 183 pages
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Elementary Trigonometry

James Hamblin Smith - Trigonometry - 1870 - 286 pages
...At a point 200 feet from a tower and on a level with its base the angle of elevation of its summit is found to be 60° : what is the height of the tower Î (2) What is the height of a tower whose top appears at an elevation of 30° to an observer 140 feet...
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Plane and Spherical Trigonometry

Levi Leonard Conant - Trigonometry - 1909 - 320 pages
...mast, and makes an angle of 50° 56' with the level of the ground. What is the height of the mast ? -V- 68. The top of a flag pole, broken by the wind, falls...observation to the foot of the tower. From the triangle A CD — = tan 30° = — 300 + y .-. y = v/3:r-300; from the triangle BCD - = tan 60° = V3, y V3"' equating...
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Plane Trigonometry

George Wentworth, David Eugene Smith - Plane trigonometry - 1914 - 348 pages
...limits which differ by 3' 40". 53. At a horizontal distance of 120 ft. from the foot of a steeple, the angle of elevation of the top is found to be 60° 30'. Find the height of the steeple above the instrument. 64. From the top of a rock which rises vertically...
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Plane and Spherical Trigonometry

George Wentworth, David Eugene Smith - Trigonometry - 1915 - 388 pages
...limits which differ by 3' 40". 63. At a horizontal distance of 120 ft. from the foot of a steeple, the angle of elevation of the top is found to be 60° 30'. Find the height of the steeple above the instrument. 54. From the top of a rock which rises vertically...
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Paractical Geometry Based on the Various Geometry Books by Godfrey and Siddons

480 pages
...72°. Find the distance of P from A. Ex. 47. From a point A on a level road running straight towards a tower the angle of elevation of the top is found to be 21°, and that from another point 200 yd. nearer the tower is found to be 46". Find the height of the...
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