Elementary Trigonometry |
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Page 42
... tower the angle of elevation of the top is 30 ° . Find the height of the tower and the observer's distance from the top . 5. A ladder 45 feet long just reaches the top of a wall . If the ladder makes an angle of 60 ° with the wall ...
... tower the angle of elevation of the top is 30 ° . Find the height of the tower and the observer's distance from the top . 5. A ladder 45 feet long just reaches the top of a wall . If the ladder makes an angle of 60 ° with the wall ...
Page 43
... tower the angle of elevation of the top of a column is 60 ° , and from the top of the tower , which is 50 ft . high , the angle of elevation is 30 ° : find the height of the column . Let AB denote the column and CD the tower ; draw CE ...
... tower the angle of elevation of the top of a column is 60 ° , and from the top of the tower , which is 50 ft . high , the angle of elevation is 30 ° : find the height of the column . Let AB denote the column and CD the tower ; draw CE ...
Page 44
... tower seen from a monument 96 feet high are 30 ° and 60 ° : find the height of the tower . 16. From the top of a cliff 150 feet high the angles of depression of two boats at sea , each due north of the observer , are 30 ° and 15 ° : how ...
... tower seen from a monument 96 feet high are 30 ° and 60 ° : find the height of the tower . 16. From the top of a cliff 150 feet high the angles of depression of two boats at sea , each due north of the observer , are 30 ° and 15 ° : how ...
Page 81
... tower is 68 ° 11 ' , and a flagstaff 24 ft . high on the summit of the tower subtends an angle of 2 ° 10 ′ at the observer's eye . Find the height of the tower , given tan 70 ° 21 ' 2.8 , cot 68 ° 11 ' = ' 4 . H. K. E. T. 6 CHAPTER X ...
... tower is 68 ° 11 ' , and a flagstaff 24 ft . high on the summit of the tower subtends an angle of 2 ° 10 ′ at the observer's eye . Find the height of the tower , given tan 70 ° 21 ' 2.8 , cot 68 ° 11 ' = ' 4 . H. K. E. T. 6 CHAPTER X ...
Page 186
... tower is A. On advancing a feet towards the tower the elevation is 45 ° and on advancing b feet nearer the elevation is 90 ° - A : find the height of the tower . 6. A person observes that two objects A and B bear due N. and N. 30 ° W ...
... tower is A. On advancing a feet towards the tower the elevation is 45 ° and on advancing b feet nearer the elevation is 90 ° - A : find the height of the tower . 6. A person observes that two objects A and B bear due N. and N. 30 ° W ...
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Common terms and phrases
1+cos 1+tan² a+cos a+sin a+ß A+tan acute angle angle of elevation B+cos centre circle cos A cos cos² cos³ cosec cosine cot² cyclic quadrilateral decimal denote diff equal equation ex-central triangle Example expression feet Find the angle find the distance find the height Find the number Find the value flagstaff following identities formula fraction given log greatest angle Hence horizontal plane hypotenuse integer loga magnitude mantissa miles negative number of radians obtain pedal triangle perpendicular positive Prove the following quadrant quadrilateral quantities radian measure radius vector regular polygon right angle right-angled triangle sec² sexagesimal shew sin A sin sin sin sin sin² sin³ sine solution solve the triangle supplementary angles tan² tangent tower triangle ABC trigonometrical functions trigonometrical ratios whence Зп
Popular passages
Page 131 - ... the logarithm of a fraction is equal to the logarithm of the numerator diminished by the logarithm of the denominator...
Page 179 - 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° : find the height of the mountain in yards.
Page 350 - OF EUCLID'S ELEMENTS. Including Alternative Proofs, together with additional Theorems and Exercises, classified and arranged. By HS HALL, MA, and FH STEVENS, MA, Masters of the Military and Engineering Side, Clifton College. Gl.
Page 132 - The integral part of a logarithm is called the characteristic, and the decimal part is called the mantissa.
Page 39 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius of the circle...
Page 132 - Let N be a number whose integral part contains n digits ; then JV= JQ<il>HftiMlon . .'. log^V=(?t— l) + a fraction. Hence the characteristic is и — 1 ; that is, the characteristic of the logarithm of a number greater than unity is less by one than the number of digits in its integral part, and is positive.
Page 187 - From the top of a hill the angles of depression of two objects situated in the...
Page viii - ... equal parts, called degrees; a degree into 60 equal parts, called minutes; a minute into 60 equal parts, called seconds. Degrees, minutes, and seconds are indicated in connection with numbers by the respective symbols °, ', ". 25 degrees, 18 minutes, 34 seconds is written 25° 18
Page xi - Ratio is the relation which one quantity bears to another of the same kind, with reference to the number of times that the one is contained in the other.
Page 348 - We will not say that this is the best Elementary Algebra for school use that we have come across, but we can say that we do not remember to have seen a better. . . . It is the outcome of a long experience of schoolteaching, and so is a thoroughly practical book. All others that we have in our eye are the works of men who have had considerable experience with senior and junior students at the universities, but have had little...