 A person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 50°; walking 40 ft.  Plane Trigonometry - Page 44by Sidney Luxton Loney - 1893 - 480 pagesFull view - About this book
 | John Maximilian Dyer - Plane trigonometry - 1891 - 306 pages
...subtended by its spire. Show that the Íj2 I J¿¡ height of the spire is — =-; . Ъ. 0 a? — № (7) A person standing on the bank of a river observes that the top of a tower on the edge of the opposite side subtends an angle of 55° with a horizontal line drawn... | |
 | James Morford Taylor - History - 1904 - 192 pages
...the base of the chimney the angle of elevation of the top is 45°. Find the height of the chimney. 8. A person standing on the bank of a river observes...angle subtended by a tree on the opposite bank is 50°; walking 40 ft. from the bank he finds the angle to be 30°. Find the height of the tree and the... | |
 | James Morford Taylor - Trigonometry - 1905 - 256 pages
...the base of the chimney the angle of elevation of the top is 45°. Find the height of the chimney. 8. A person standing on the bank of a river observes...angle subtended by a tree on the opposite bank is 50° ; walking 40 ft. from the bank he finds the angle to be 30°. Find the height of the tree and... | |
 | University of Calcutta - 1913 - 816 pages
...minutes. 4. (a) Given o-6=2-54, c=39-45, C=46°27; find the angles 60 A and B of the triangle ABC. (b) A person standing on the bank of a river observes that the 60 elevation of the top of a tree on the opposite bank is 51°15' and when he retires 30 feet from... | |
 | 1916 - 466 pages
...altitude is 24. TRIGONOMETRY b. Describe e variations In sin x as x varies from — 180° to 180°. 2. A person standing on the bank of a river observes...he retires 40 feet from the bank he finds the angle subten.'ed to be 30°. Find the height of the tree and the breadti of the river. 3. Derive the mnctlons... | |
 | B. S. Vatssa - 2002 - 1512 pages
...pole is (a) 20 m and 20-Уз m (b) 20 m and 60 m (c) 20 m and 30 m (d) 16 m and 48 m. (HT 1964) 12. A person standing on the bank of a river observes...tree on the opposite bank is 60°, when he retires 40 meter from the bank he finds the angle to be 30°. Then the width of the river is (a) 20 m (b) 40 m... | |
 | 1242 pages
...towards the foot of the cliff, the angle of elevation ofA is 44°. Find the height of the cliff. 18. A person standing on the bank of a river observes...angle subtended by a tree on the opposite bank is 62° 19'. When he retires 100 m from the bank, he finds the angle to be 27° 58'. Find the height of... | |
 | 288 pages
...respectively 13 ft. and 21 ft., and that they are 30 yd. apart. How far is he from the nearer post? 18. A person standing on the bank of a river observes that the elevation of a tree on the opposite bank is 60°. He walks backward 40 ft. and then finds that its... | |
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