A Treatise on Elementary TrigonometryMacmillan, 1892 - 306 páginas |
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Página 1
... yards it contains . 2. To know the measurement of any quantity then , we must have two things . First , we must have ... yards , = -4400 yards = 4400 × 1 yard , therefore the measure is 4400 when a yard is the unit . L. E. T. 1 Example 3 ...
... yards it contains . 2. To know the measurement of any quantity then , we must have two things . First , we must have ... yards , = -4400 yards = 4400 × 1 yard , therefore the measure is 4400 when a yard is the unit . L. E. T. 1 Example 3 ...
Página 2
... yards . b miles ? Example 4. If the unit be a yards , what is the measure of b miles = b x 1760 yards , b x 1760 .. b miles = × α yards , α b × 1760 .. the measure required is α EXAMPLES . I. ( 1 ) What is the measure of 1 mile when a ...
... yards . b miles ? Example 4. If the unit be a yards , what is the measure of b miles = b x 1760 yards , b x 1760 .. b miles = × α yards , α b × 1760 .. the measure required is α EXAMPLES . I. ( 1 ) What is the measure of 1 mile when a ...
Página 3
... yards when b feet is the unit ? a yards = 3a feet : = За b xb feet , За .. the measure is ( ii ) How many times does a yards contain b feet ? За As in ( i ) , a yards : = xb feet . b За Answer . times . b ( iii ) What is the ratio of a ...
... yards when b feet is the unit ? a yards = 3a feet : = За b xb feet , За .. the measure is ( ii ) How many times does a yards contain b feet ? За As in ( i ) , a yards : = xb feet . b За Answer . times . b ( iii ) What is the ratio of a ...
Página 4
... yards 3a = b feet b ' .. the required fraction is За b * EXAMPLES . II . ( 1 ) The ratio of the area of one field to that of another is 20 : 1 , and the area of the first is half a square mile . Find the number of square yards in the ...
... yards 3a = b feet b ' .. the required fraction is За b * EXAMPLES . II . ( 1 ) The ratio of the area of one field to that of another is 20 : 1 , and the area of the first is half a square mile . Find the number of square yards in the ...
Página 7
... yards and one side is 60 yards : find the length of the other side . ( 3 ) One end of a rope 52 feet long is tied to the top of a pole 48 feet high and the other end is fastened to a peg in the ground . If the pole be vertical and the ...
... yards and one side is 60 yards : find the length of the other side . ( 3 ) One end of a rope 52 feet long is tied to the top of a pole 48 feet high and the other end is fastened to a peg in the ground . If the pole be vertical and the ...
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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...