Trigonometry for BeginnersMacmillan, 1896 - 147 páginas |
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Página 26
... column , the angle of elevation of the top of the column is observed to be 45 ° ; what is the height of the column ? 2. 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 ...
... column , the angle of elevation of the top of the column is observed to be 45 ° ; what is the height of the column ? 2. 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 ...
Página 86
... column headed 4 , the number .60895 . .. log 4064. = 3.60895 . EXAMPLE 2. To find log .04064 . This logarithm differs from the former as to the characteristic , which is - - 2 . ( b ) To find the logarithm of a number ... log .04064 ...
... column headed 4 , the number .60895 . .. log 4064. = 3.60895 . EXAMPLE 2. To find log .04064 . This logarithm differs from the former as to the characteristic , which is - - 2 . ( b ) To find the logarithm of a number ... log .04064 ...
Página 88
... column headed 7 , the given man- tissa 41447 . ... log 2.597.41447 . The characteristic 3 shows there are four figures to the left of the decimal point . Hence the number required is 2597 . EXAMPLE 2. The number whose logarithm is ...
... column headed 7 , the given man- tissa 41447 . ... log 2.597.41447 . The characteristic 3 shows there are four figures to the left of the decimal point . Hence the number required is 2597 . EXAMPLE 2. The number whose logarithm is ...
Página 89
... column headed log sin @ under 15 ° , we find 9.42416 , i.e. log sin 15 ° 25 ′ = 9.42461 . EXAMPLE 2. To find log sin 74 ° 20 ' 40 " . Log sin 74 ° 20 ′ 40 ′′ cannot be found directly in the tables . Hence we must interpolate . We assume ...
... column headed log sin @ under 15 ° , we find 9.42416 , i.e. log sin 15 ° 25 ′ = 9.42461 . EXAMPLE 2. To find log sin 74 ° 20 ' 40 " . Log sin 74 ° 20 ′ 40 ′′ cannot be found directly in the tables . Hence we must interpolate . We assume ...
Página 90
... column headed log sin @ above 74 ° , we find 9.98356 , i.e. log sin 74 ° 20 ' = 9.98356 Similarly log sin 74 ° 21 ' = 9.98359 - 3 Hence the difference of 1 ' ( i.e. 60 ' ) in the angle corresponds to a difference .00003 in the log sin ...
... column headed log sin @ above 74 ° , we find 9.98356 , i.e. log sin 74 ° 20 ' = 9.98356 Similarly log sin 74 ° 21 ' = 9.98359 - 3 Hence the difference of 1 ' ( i.e. 60 ' ) in the angle corresponds to a difference .00003 in the log sin ...
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Términos y frases comunes
angle of elevation angle XOP Asin Atan centre circle circular measure circumference common logarithms cos² cosec cosine cot² cotangent decimal diameter difference distance equal equation EXAMPLE Express find log find the angles find the height find the logarithm Find the number find the sine following angles formulæ fraction Geom geometrical given greatest angle Hence inverse trigonometric functions length less than 90 Let XOP log cot log log tan log magnitude mantissa miles negative number of degrees number whose logarithm observed perpendicular plane positive quadrant radians respectively right angles right triangle right-angled triangle sec² sin B sin sin² sin³ Solve the triangle spherical triangle student subtended tan log sin tan² tangent tower triangle ABC trigonometric functions trigonometrical ratios XOP₁ yards ΙΟ ΙΟΙ
Pasajes populares
Página 85 - FRACTION is a negative number, and is one more than the number of ciphers between the decimal point and the first significant figure.
Página 6 - A radian is an angle at the center of a circle, subtended by an arc equal in length to the radius of the circle.
Página 85 - The characteristic of the logarithm of a number greater than unity is one less than the number of figures in the integral part of the number.
Página 118 - To prove that sin (A - B) = sin A cos B - cos A sin B, and cos (A — £) = cos A cos B + sin A sin B.
Página 25 - 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?
Página 126 - A cos 6 = cos a cos c + sin a sin c cos B cos c = cos a cos 6 + sin a sin 6 cos C Law of Cosines for Angles cos A = — cos B...
Página 117 - Express in degrees, minutes, etc., (i.) the angle whose circular measure is ^V7'"! (".) t^e angle whose circular measure is 5. If the angle subtended at the centre of a circle by the side of a regular pentagon be the unit of angular measurement, by what number is a right angle represented ? 2. Find, by geometrical constructions, the cosine of 45° and the sine of 120°. Prove that (sin 30° + cos 30°) (sin 120° + cos 120°) = sin 30°. 3. If esc A = 9, find cot A and sec A. 4. Prove that cos (180°...
Página 107 - 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 vii - ... are not as many figures in the quotient as there are ciphers annexed to the dividend. In such a case, supply the deficiency, as in the division of decimals, by prefixing a cipher or ciphers to the quotient before annexing.