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" From the top of a hill the angles of depression of two successive milestones, on a straight level road leading to the hill, are observed to be 5° and 15°. "
Five-place Logarithmic and Trigonometric Tables - Page 29
by George Albert Wentworth, George Anthony Hill - 1903 - 75 pages
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Mathematical Exercises ...

Samuel H. Winter - 1864 - 348 pages
...1±6 = tan ? (A + B). ' a— It tan £ (А— в) 9. What is the angle of depression of an object ? From the top of a hill the angles of depression of two consecutive muestones on a straight, level road, were found to be 12° 13' and 2° 45' : find the height...
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Plane trigonometry and logarithms

John Walmsley - Logarithms - 1865 - 232 pages
...the tower to be 15° from S. How far is it from tower to steeple ? Given cot 75° = -26 nearly. 16. From the top of a hill the angles of depression of two consecutive milestones on a straight, level road, were found to be 12° 13' and 2° 45': find the height...
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A collection of elementary test questions in pure and mixed mathematics ...

James Robert Christie - Mathematics - 1866 - 426 pages
...and у respectively. Find the distance between the objects ; the height of the tower being h. 812. From the top of a hill the angles of depression of two objects in the plain at its base were observed to be 45° and 30°, and the horizontal angle between...
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Elementary Trigonometry

James Hamblin Smith - Trigonometry - 1877 - 244 pages
...bottom of the wall the flagstaff subtends an angle of 10°. Find the distance of E from the wall. (28) From the top of a hill the angles of depression of two consecutive mile-stones on a straight level road are found to bo 12°. 13' and 2°. 45'. Find the height...
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The Cambridge Examiner, Volume 1

Education, Higher - 1881 - 504 pages
...the secant in terms of the cotangent. Give the proper sign for an angle between 180° and 225°. 3. From the top of a hill the angles of depression of two consecutive milestones were observed to be 30° and 15°. What was the height of the hill ? 4. Name...
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Plane and Spherical Trigonometry

George Albert Wentworth - Trigonometry - 1882 - 234 pages
...its foot it will reach a window 21 feet high on the other side. Find the breadth of the street. 71. From the top of a hill the angles of depression of...observed to be 5° and 15°. Find the height of the hill. 72. A fort stands on a horizontal plain. The angle of elevation at a certain point on the plain is...
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Plane and Spherical Trigonometry: G. A. Wentworth ...

George Albert Wentworth - Trigonometry - 1884 - 330 pages
...its foot it will reach a window 21 feet high on the other side. Find the. breadth of the street. 71. From the top of a hill the angles of depression of...observed to be 5° and 15°. Find the height of the hill. 72. A fort stands on a horizontal plain. The angle of elevation at a certain point on the plain is...
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Plane and Spherical Trigonometry: And Surveying

George Albert Wentworth - Trigonometry - 1887 - 200 pages
...moving its foot it will reach a window 21 feet high on the other side. Find the breadth of the street. angles of depression of two successive milestones, on a straight level road leading to the hill, arc observed to be 5° and 15°. Find the hsight of the hill. 71. From the top of a hill the cos B...
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Five-place Logarithmic and Trigonometric Tables

George Albert Wentworth - 1887 - 346 pages
...the elevation of the column, at the observer's station, is 45°. Find the height of the column. 62. From the top of a hill the angles of depression of two objects situated in the horizontal plane of the base of the hill are 45° and 30° ; and the horizontal...
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Plane Trigonometry

George Albert Wentworth - 1887 - 206 pages
...the elevation of the column, at the observer's station, is 45°. Find the height of the column. 62. From the top of a hill the angles of depression of two objects situated in the horizontal plane of the base of the hill are 45° and 30° ; and the horizontal...
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