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Bøker Bok 110 av 21From a station B at the base of a mountain its summit A is seen at an elevation of...
" From a station B at the base of a mountain its summit A is seen at an elevation of 60°; after walking one mile towards the summit up a plane making an angle of 30° with the horizon to another station C, the angle BCA is observed to be 135°. "
Plane and Spherical Trigonometry - Side 91
av Henry Nathan Wheeler - 1876 - 163 sider
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Register

University of Cambridge - 1831
...rectum L meet the axis in T; shew that -7^, = the eccentricity. j3 J. 2. From a station B at the hase of a mountain its summit A is seen at an elevation...walking one mile towards the summit up a plane making 30° with the horizon, to another station C, the angle BCA is observed to be 135°. Find the height...
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New Series of The Mathematical Repository, Volum 6

Thomas Leybourn - 1835
...the extremity of the latus rectum / AS meet the axis in T ; shew that -7=- = the eccentricity. A i 8. From a station B at the base of a mountain its summit J is seen at an elevation of 60°: after walking one mile towards the summit up a plane making 30°...
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Mathematical Problems and Examples, Arranged According to Subjects, from the ...

1836 - 335 sider
...n be integral or fractional. 78. Express (sin A)4n+i in terms of the sines of the multiple arcs79. From a station B at the base of a mountain, its summit...walking one mile towards the summit up a plane making 30° with the horizon, to another station C, the angle BCA is observed to be 135°. Find the height...
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An Elementary Course of Mathematics: Designed Principally for Students of ...

Harvey Goodwin - 1846 - 468 sider
...and a? = -7 ---- ~ ---- -- ---- • • - . V cosec'' a + cosec2 p — 2 cosec a cosec p cos y Ex. 3. From a station B at the base of a mountain, its summit...walking one mile towards the summit up a plane making art angle of 30° CLANB TRIGONOMRTRY. with the horizon, to another station C, the angle BCA is observed...
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A collection of problems and examples adapted to the 'Elementary course of ...

Harvey Goodwin (bp. of Carlisle.) - 1847 - 80 sider
...calculations, necessary for determining the breadth of a river, from stations upon one of its banks. the horizon, to another station C, the angle BCA is...be 135°. Find the height of the mountain in yards. 17- An object 6 feet high, placed on the top of a tower, subtends an angle the tangent of which is...
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An Elementary Course of Mathematics: Designed Principally for Students of ...

Harvey Goodwin - 1849 - 528 sider
...cosec a cosec ft cos y, a and x ma =• . V cosec2 a + cosec2 ft — 2 cosec a cosec ft cos y Ex. 3. From a station B at the base of a mountain, its summit...with the horizon, to another station C, the angle EC A is observed to be 135°. Find the height of the mountain. From the triangle ABC, we have sin BCA...
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First book on plane trigonometry, comprising geometrical trigonometry

George Wirgman Hemming - 1851
...A and the same post is 86° 24' 15". Find the distance of the post from A. Ans. 1439 ft. 2 in. 32. From a station B at the base of a mountain its summit...After walking one mile towards the summit up a plane inclined 30° to the horizon to another station C the angle ECA is observed to be 135°. Find the height...
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A collection of problems and examples, adapted to the "Elementary course of ...

Harvey Goodwin - 1851 - 173 sider
...calculations, necessary for determining the breadth of a river, from stations upon one of its banks. 16. From a station B, at the base of a mountain, its summit A is seen at an elevation of 60°; after walking l mile towards the summit, up a plane making an angle of 30° with the horizon, to another station...
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Plane trigonometry. [With] Solutions of examples

John William Colenso (bp. of Natal.) - 1851
...angle, then AD-.BD-.-.l- tan'(^ai) : 1 4 tan±(AB). 224. Solve the equation 2 cos2A = 2 sin^í + 1. 225. From a station B, at the base of a mountain, its summit Л is seen at an elevation of 60°; and, after walking one mile towards the summit, up a plane making...
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The elements of plane and spherical trigonometry

John Hind - 1855
...Distances. 45. From a station D at the base of a mountain, a A 15 "" С ft E person observes its summit A at an elevation of 60°: after walking one mile towards the summit, along a plane making 30° with the horizon, to another station F, he finds the angle DFA to be 135°...
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