A Treatise of Plane Trigonometry: To which is Prefixed a Summary View of the Nature and Use of Logarithms : Being the Second Part of a Course of Mathematics, Adapted to the Method of Instruction in the American Colleges |
From inside the book
Results 1-5 of 58
Page 52
... angle . Thus the sine BG , and the tangent AD ( Fig . 3. ) are opposite to the angle DCA . But the secant CD is one of the lines which include the angle . 89. The sine complement or COSINE of an angle , 52 TRIGONOMETRY .
... angle . Thus the sine BG , and the tangent AD ( Fig . 3. ) are opposite to the angle DCA . But the secant CD is one of the lines which include the angle . 89. The sine complement or COSINE of an angle , 52 TRIGONOMETRY .
Page 53
... cosine of GCA . On the other hand GB is the sine of GCA , and the cosine of GCH . So also the cotangent of an angle is the tangent of the com- plement of the angle . Thus HF is the cotangent of GCA . And the cosecant of an angle is the ...
... cosine of GCA . On the other hand GB is the sine of GCA , and the cosine of GCH . So also the cotangent of an angle is the tangent of the com- plement of the angle . Thus HF is the cotangent of GCA . And the cosecant of an angle is the ...
Page 54
... cosine ; and that LC , between the cosine and center , is par- allel and equal to the sine ; ( Euc . 34. 1. ) so that one may be taken for the other , in any calculation . 93. From these similar triangles , are derived the following ...
... cosine ; and that LC , between the cosine and center , is par- allel and equal to the sine ; ( Euc . 34. 1. ) so that one may be taken for the other , in any calculation . 93. From these similar triangles , are derived the following ...
Page 55
... Each , therefore , is equal to half 120 ° , that is to 60 ° . * Sine is here put for the square of the sine , cos2 for the square of the cosine , & c . All the angles being equal , the sides are equal SINES , TANGENTS , & c . 55.
... Each , therefore , is equal to half 120 ° , that is to 60 ° . * Sine is here put for the square of the sine , cos2 for the square of the cosine , & c . All the angles being equal , the sides are equal SINES , TANGENTS , & c . 55.
Page 56
... cosine of 60 ° is equal to half radius . For the cosine of 60 ° is the sine of 30 ° . ( Art . 89. ) Cor . 2. The cosine of 30 ° √3 . For Cos 30 ° R3 - sin2 30 ° -1-1 = 3 . = Therefore , Cos 30 ° √√3 . 96. b . The sine of 45 ° - For ...
... cosine of 60 ° is equal to half radius . For the cosine of 60 ° is the sine of 30 ° . ( Art . 89. ) Cor . 2. The cosine of 30 ° √3 . For Cos 30 ° R3 - sin2 30 ° -1-1 = 3 . = Therefore , Cos 30 ° √√3 . 96. b . The sine of 45 ° - For ...
Other editions - View all
A Treatise of Plane Trigonometry: To Which Is Prefixed, a Summary View of ... Jeremiah Day No preview available - 2017 |
A Treatise of Plane Trigonometry: To Which Is Prefixed, a Summary View of ... Jeremiah Day No preview available - 2018 |
A Treatise of Plane Trigonometry: To Which Is Prefixed a Summary View of the ... Jeremiah Day No preview available - 2018 |
Common terms and phrases
ABC Fig ABCD altitude axis base breadth bung diameter calculation cask circle circular sector circular segment circumference column cosecant cosine cotangent course cube cubic decimal departure Diff difference of latitude difference of longitude distance divided earth equal to half equator figure find the area find the SOLIDITY frustum given sides gles greater hypothenuse inches inscribed lateral surface length less logarithm longitude measured Mercator's meridian meridional difference middle diameter miles multiply the sum number of degrees number of sides oblique parallelogram parallelopiped perpendicular perpendicular height plane sailing prism PROBLEM proportion pyramid quadrant quantity quotient radius ratio regular polygon right angled triangle right cylinder rods rule secant sector segment ship sine sines and cosines slant-height sphere spherical subtract tables tangent term theorem trapezium triangle ABC Trig trigonometry wine gallons zone
Popular passages
Page 81 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Page 43 - A cone is a solid figure described by the revolution of a right angled triangle about one of the sides containing the right angle, which side remains fixed.
Page 50 - The surface of a sphere is equal to the product of its diameter by the circumference of a great circle.
Page 55 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Page 69 - It will be sufficient to lay the edge of a rule on C, so as to be parallel to a line supposed to pass through B and D, and to mark the point of intersection G. 126. If after a field has been surveyed, and the area computed, the chain is found to be too long or too short ; the true contents may be found, upon the principle that similar figures are to each other as the squares of their homologous sides.
Page 118 - The sum of any two sides of a triangle is to their difference, as the tangent of half the sum of the angles opposite to those sides, to the tangent of half their difference.
Page 89 - Divide the height of the segment by the diameter of the circle ; look for the quotient in the column of heights in the table ; take out the corresponding number in the column of areas ; and multiply it by the square of the diameter.