A Treatise on Elementary TrigonometryMacmillan, 1892 - 306 páginas |
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Página 60
... objects respectively . 6 A Theodolite is an instrument for measuring angles in a horizontal plane ; also for measuring angles of elevation ' and angles of ... object , is called ( i ) its angle of elevation , when the 60 TRIGONOMETRY .
... objects respectively . 6 A Theodolite is an instrument for measuring angles in a horizontal plane ; also for measuring angles of elevation ' and angles of ... object , is called ( i ) its angle of elevation , when the 60 TRIGONOMETRY .
Página 61
John Bascombe Lock. ( i ) its angle of elevation , when the object is above the observer ; ( ii ) its angle of depression , when the object is below the observer . + 100. Trigonometry enables us by measuring certain angles , to deduce ...
John Bascombe Lock. ( i ) its angle of elevation , when the object is above the observer ; ( ii ) its angle of depression , when the object is below the observer . + 100. Trigonometry enables us by measuring certain angles , to deduce ...
Página 226
... object on the opposite bank ; the angles BAC , and CBA are observed to be 65 ° 37 ′ and 53 ° 4 ′ respectively . Prove that the perpendicular breadth of the river at C is 829.87 feet ; having given L sin 65 ° 37 ' = 9.9594248 , L cosec ...
... object on the opposite bank ; the angles BAC , and CBA are observed to be 65 ° 37 ′ and 53 ° 4 ′ respectively . Prove that the perpendicular breadth of the river at C is 829.87 feet ; having given L sin 65 ° 37 ' = 9.9594248 , L cosec ...
Página 229
... objects subtend at his eye is a . From the place where this happens he walks a yards ; the objects then appear in a straight line making a right angle with the road . Prove that the distance between the objects is ( 2 a tan a ) yards ...
... objects subtend at his eye is a . From the place where this happens he walks a yards ; the objects then appear in a straight line making a right angle with the road . Prove that the distance between the objects is ( 2 a tan a ) yards ...
Página 252
... objects . M IN Let P , Q be two visible distant objects seen from a place of obser- vation O. Let PM , QN perpendiculars be let fall from P and Q respectively to the horizontal plane passing through 0 . Then the horizontal angle ...
... objects . M IN Let P , Q be two visible distant objects seen from a place of obser- vation O. Let PM , QN perpendiculars be let fall from P and Q respectively to the horizontal plane passing through 0 . Then the horizontal angle ...
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Términos y frases comunes
algebraical angle of elevation angle ROP angular arithmetical base centre circular measure circumference circumscribing circumscribing circles common logarithms cos² cos³ cosec cosine cosine and tangent decimal described diameter distance distant object equal Express find log Find the angle Find the height Find the length Find the number find the sine formulæ fraction geometrically given that log greater Hence horizontal hypotenuse inches initial line inscribed circle isosceles triangle less Let ROP magnitude miles negative number of degrees observed opposite perimeter perpendicular positive Prove the following Quadrant radians radius regular polygon respectively revolving line right angle right-angled triangle sec² sides significant figures sin² sin³ sine square student subtended tan² tangent telescope Theodolite tower Trace the changes triangle ABC Trigono Trigonometrical Ratios vernier yards ОР
Pasajes populares
Página 14 - It follows that the ratio of the circumference of a circle to its diameter is the same for all circles.
Página 12 - A trapezoid has only two of its sides parallel ; as ABCD. (Fig. 4.) Any other four sided figure is called a trapezium. II. A figure which has more than four sides is called a polygon. A regular polygon has all its sides equal, and all its angles equal. III. The height of a triangle is the length of a perpendicular, drawn from one of the angles to the opposite side ; as CP. (Fig. 5.) The height of a four sided figure is the perpendicular distance between two of its parallel sides ; as CP.
Página 274 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
Página 59 - At a point 200 feet from, and on a level with the base of a tower, the angle of elevation of the top of the tower is observed to be 60° ; what is the height of the tower ? 8.
Página 129 - T' formulae. 2 sin A . cos B = sin (A + B) + sin (A -B), ' 2 cos A . sin B = sin (A + B) — sin (A - B), h 1v.
Página 30 - VI. 33) angles at the centre of the same circle are to one another as the arcs on which they stand...
Página 225 - The elevation of a steeple at a place due south of it is 45°, and at another place due west of it the elevation is 15°. If the distance between the two places be a, prove that the height of the steeple is a( \/3 — 1) -^2\/3.
Página 242 - Now, twice the area of a polygon circumscribed about a circle is equal to (the radius x the perimeter).
Página 256 - Prove that sin (A + B) = sin A cos B + cos A sin B, and deduce the expression for cos (A + B).
Página 288 - Show how to solve a triangle when two sides and the included angle are given. If two sides of a triangle are 71 and 25 feet and the contained angle 69° 32...