 | University of Cambridge - 1849 - 560 pages
...height of an object above a horizontal plane from observations made at two given stations in the plane. The angular elevation of a tower at a place A due...it is 30", and at a place B, due west of A, and at the distance a from it, the elevation is 18° ; shew that the height of the tower is " . V2V5+2 15.... | |
 | Harvey Goodwin - Mathematics - 1851 - 196 pages
...height of an object above a horizontal plane, from observations made at two given stations in the plane. The angular elevation of a tower at a place A due...it is 30°, and at a place B, due west of A, and at the distance a from it, the elevation is 18°; shew that the height of the tower is V/2\/5 15. Define... | |
 | Francis James Jameson - Mathematics - 1851 - 144 pages
...an object above a horizontal plane from observations made at two given stations in the plane. (B}. The angular elevation of a tower at a place A due south of it is 30°, and at a place J5, due west of A, and at a distance a from it the elevation is 18° : shew that the height of the... | |
 | 1857 - 486 pages
...bisect AS = 2 e, the base of the triangle ABC, then area of the triangle = J (;2 — c2) tan. C. 8. The elevation of a tower at a place A due south of it is 30°, and at a place B, due west of A, and a feet from A is 18°; show that the tower's height = — / =• V/2+V5 9. Let AB C, AS D be two equal... | |
 | Richard Dunkley Beasley - Plane trigonometry - 1858 - 144 pages
.... sin (a — ß) sin (a + 0) then Biuß = — -*—- 23. If tan £ = 2 - V3, find sin a. в 24. The elevation of a tower at a place A due south of it is 30° ; and at a place Д due west of A, and at the distance a from it, the elevation is 18° : shew that the height of the... | |
 | Thomas Percy Hudson - Trigonometry - 1862 - 202 pages
...to move in a straight line parallel to the horizon, find the direction of its course. Ans. WNW 16. The angular elevation of a tower at a place A due south of it is a, and at a place j3 due west of A, and at a distance a from it, the elevation is /3. Find the height... | |
 | Thomas Percy Hudson - Trigonometry - 1862 - 218 pages
...Ans. WNW 16. The angular elevation of a tower at a place A due south of it is a, and at a place ft due west of A, and at a distance a from it, the elevation is p. Find the height of the tower. a sin a sin 8 Ans. — V{sin(a+/3) sin(a-/3)J 17- A tower 150 feet... | |
 | John Walmsley - Logarithms - 1865 - 232 pages
...c, observes that the first tower subtends an angle of 45° ; find the height of the first tower. 18. The angular elevation of a tower at a place A due...is 30° ; and at a place B, due west of A, and at the distance a from it, the elevation is 18° ; show that the height of the tower is a 19. The elevation... | |
 | Isaac Todhunter - Plane trigonometry - 1874 - 360 pages
...a norizontal, base of 100 yards measured from its foot. Find the height of the tower. s~<~\ ; 4x i The angular elevation of a tower at a place A due south of it is 30° ; and at a place Д due west of A, and at the distance a from it, the elevation is 18° : shew that the height of the... | |
 | Education, Higher - 1884 - 538 pages
...third side, show that, a? + Ci c2 = b2. 2;' Find the Trigonometrical Ratios for an angle of 18°. The elevation of a tower at a place A due south of it...and at a distance a from it, the elevation is 18°. Show that the height of the tower is v/OVS + 2)' 3. Find general expressions for all angles (1) with... | |
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The angular elevation of a tower at a place A due south of it is 30° ; and at a place B due west of A, and at a distance a from it, the elevation is 18°... 
