Books Books
A person standing at the edge of a river observes that the top of a tower on the edge of the opposite side subtends an angle of 55°...
Elementary Trigonometry - Page 133
by James Hamblin Smith - 1870 - 224 pages

## Mathematical Problems and Examples, Arranged According to Subjects, from the ...

Mathematics - 1836 - 366 pages
...Assuming cos A = ^ , deduce an expression /&OC for the area of a triangle in terms of the sides. 84. A person standing at the edge of a river observes...the opposite side subtends an angle of 55° with a horizontal line drawn from his eye ; receding backwards 30 feet, he then finds it to subtend an angle...

## General Report on Public Instruction in the Bengal Presidency

Education - 1843 - 570 pages
...as A increases from 0» to 360°. shew that tan. *£ г *™' i"*1"- s A" *= 2 sin. Af.sin. Z A. !2- A person standing at the edge of a river observes that the top of a tower on the opposite side subtends an angle of 65° with a horizonЫ line drawn from his eye : receding 30 feet,...

## A system of practical mathematics; being no.xvi. of a new series of school-books

Scottish school-book assoc - 1845 - 434 pages
...a river, observed that the top of a tower placed on the opposite side, subtended an angle of 59°, with a line drawn from his eye parallel to the horizon; receding backwards for 50 feet, he then found that it subtended an angle of 49°. Required the height of the tower, and...

## A collection of problems and examples adapted to the 'Elementary course of ...

Harvey Goodwin (bp. of Carlisle.) - Mathematics - 1847 - 130 pages
...angle was taken, the angular height of the mountain was 11° 18'. Required the mountain's height. 4. A person standing at the edge of a river observes...drawn from his eye parallel to the horizon ; receding 30 feet, he finds it to subtend an angle of 48°. Determine the breadth of the river. 5. A person on...

## General Report on Public Instruction in the Bengal Presidency

Education - 1852
...terms of its tangent, and apply the formula to obtain a rapidly converging series for calculating v. 8. A person standing at the edge of a river observes...feet, he then finds it to subtend an angle of 48°. Determine the breadth of the river. log. sin 7° = 9.0S589 log. sin 35° = 9."5859 log. sin 48° =...

## Scholarship examinations of 1846/47 (-1853/54).

Bengal council of educ - 1852 - 348 pages
...of its tangent, and apply the formula to obtain a rapidly converging series for calculating TT. (8.) A person standing at the edge of a river observes...feet, he then finds it to subtend an angle of 48°. Determine the breadth of the river. log. sin 7° = 9.08589 log. sin 35° = 9-75859 log. sin 48° =...

## A Treatise on Plane and Spherical Trigonometry, and on Trigonometrical ...

John Hymers - Logarithms - 1858 - 232 pages
...BAC~ 20(1 + tan» BA C) ~ 100 ; 57° 29577 .'. ¿ PAC = '— -'--— = 0". 5729577 = 34'. 22",64. 54. A person standing at the edge of a river, observes...the opposite side subtends an angle of 55° with a horizontal line drawn through his eye ; receding backwards 30 feet he then finds it to subtend an angle...

## Examination papers used at the examinations for direct commissions [&c.].

War office - 1858 - 12 pages
...angles of a triangle, show that, — ABC1 sin A + sin B + sin C = 4 cos 5- cos ^ cos •\$ At £ i~ . 3. A person standing at the edge of a river observes...the opposite side subtends an angle of 55°, with a horizontal line drawn from his eye ; receding backwards 30 feet, he then finds it to subtend an angle...