 | Thomas Kimber - 1874 - 352 pàgines
...the opposite bank to be 60°; and when he retires 100 feet from the edge of the river, he observes the angle to be 30°. Find the height of the tree and the breadth of the river. 13. In any triangle ABC the tangent of half the difference of the angles В and С is to the tangent... | |
 | Thomas Kimber - 1880 - 176 pàgines
...the opposite bank to be 60°; and when he retires 100 feet from the edge of the river, he observes the angle to be 30°. Find the height of the tree and the breadth of the river. 13. In any triangle ABC the tangent of half the difference of the angles В and С is to the tangent... | |
 | James Russell Soley - 1880 - 346 pàgines
...tree on the opposite bank is a, and that the depression of the top of its image in the water is /3 ; find the height of the tree and the breadth of the river. 11. State and prove Demoivre's Theorem when the index is a whole number. State it completely when the... | |
 | 1884 - 610 pàgines
...opposite bank to be 60°, and when he retires 40 feet from the river's edge he finds the angle to be 45°. Find the height of the tree and the breadth of the river. III. — 1. Find the highest common divisor of ab (x* + y») + xy (a2 + ft»), ab (a:3 + y3} + xy (a?y... | |
 | United States. Congress. Senate - 1880 - 1304 pàgines
...tree on the opposite bank is a, and that the depression of the top of its image in the water is 3 ; find the height of the tree and the breadth of the river. 11. State and prove Demoivre's Theorem when the index is a whole number. State it completely when the... | |
 | John Maximilian Dyer - 1891 - 306 pàgines
...tree on the opposite bank to be 60° Whi-n ho retires 100 ft. from the edge of the river the angle i« 30°. Find the height of the tree and the breadth of the river. (5) In a right-angled triangle with a right angle at C, if a = 576-12, e = 873-14, find A and В :... | |
 | Edward Albert Bowser - 1892 - 202 pàgines
...angle subtended by a tree on the opposite bank to be 60°, and when he retires 40 feet from the river's bank he finds the angle to be 30° ; find the height of the tree and the breadth of the river. Ans. 20 V3 ; 20. 4. What is the height of a hill whose angle of elevation, taken at the bottom, was... | |
 | Edward Albert Bowser - 1892 - 392 pàgines
...angle subtended by a tree on the opposite bank to be 60°, and when he retires 40 feet from the river's bank he finds the angle to be 30° ; find the height of the tree and the breadth of the river. Ans. 20 V3; 20. 4. What is the height of a hill whose angle of elevation, taken at the bottom, was... | |
 | Northwest Territories Council of Public Instruction - 1897 - 628 pàgines
...opposite bank to subtend an angle of 7o\ He receded 20 ft.; the tree then subtended an angle of 60°. Find the height of the tree and the breadth of the river. SECOND CLASS. POETICAL LITERATURE. Time— Three Hour a. 1. What is the thesis which Goldsmith undertakes... | |
 | Daniel Alexander Murray - 1899 - 226 pàgines
...opposite bank is 60° ; when he retires 100 ft. from the edge of the river the angle of elevation is 30°. Find the height of the tree and the breadth of the river. -•""11. Find the distance in space travelled in an hour, in consequence of the earth's rotation,... | |
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... the angle to be 30°. Find the height of the tree and the breadth of the river, if the two points of observation are in the same horizontal line at the base of the tree. 
