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 11
Page 38
... obtuse angle in a triangle . For the sum of two obtuse angles is more than 180o . 77. The COMPLEMENT of an arc or an angle , is the differ- ence between the arc or angle and 90 degrees . The complement of the arc AB ( Fig . 2. ) is DB ...
... obtuse angle in a triangle . For the sum of two obtuse angles is more than 180o . 77. The COMPLEMENT of an arc or an angle , is the differ- ence between the arc or angle and 90 degrees . The complement of the arc AB ( Fig . 2. ) is DB ...
Page 41
... obtuse angle GCM is BG , which is also the sine of the acute angle GCA . It should be observed , however , that the sine of an acute angle is opposite to it ; while the sine of an obtuse angle falls with- out the angle , and is opposite ...
... obtuse angle GCM is BG , which is also the sine of the acute angle GCA . It should be observed , however , that the sine of an acute angle is opposite to it ; while the sine of an obtuse angle falls with- out the angle , and is opposite ...
Page 45
... obtuse angle , we may obtain it , by looking for its equal , the sine , tangent , or secant of the sup- plementary acute angle . 100. The tables are calculated for a circle whose radius is supposed to be a unit . It may be an inch , a ...
... obtuse angle , we may obtain it , by looking for its equal , the sine , tangent , or secant of the sup- plementary acute angle . 100. The tables are calculated for a circle whose radius is supposed to be a unit . It may be an inch , a ...
Page 70
... . 1. ) that there can be only one obtuse angle in a triangle , ( Art . 76. ) and therefore , that the angles opposite to the two least sides must be acute . * Euc , 11. 5 . CASE I. 150. Given , Two angles , and A 70 OBLIQUE ANGLED.
... . 1. ) that there can be only one obtuse angle in a triangle , ( Art . 76. ) and therefore , that the angles opposite to the two least sides must be acute . * Euc , 11. 5 . CASE I. 150. Given , Two angles , and A 70 OBLIQUE ANGLED.
Page 72
... obtuse , as in this example , the sine of its supplement is to be taken from the tables . ( Art . 99. ) CASE II . 151. Given Two sides , and to find An opposite angle , The remaining side , and The other two angles . One of the required ...
... obtuse , as in this example , the sine of its supplement is to be taken from the tables . ( Art . 99. ) CASE II . 151. Given Two sides , and to find An opposite angle , The remaining side , and The other two angles . One of the required ...
Other editions - View all
Common terms and phrases
acute angle added angle ACB arithmetical complement arithmetical progression b+sin base calculation centre circle cosecant Cosine Cotangent Tangent decimal degrees and minutes divided division divisor equal to radius equation errour exponents extend find the angles find the logarithm fraction geometrical progression given angle given number given side Given the angle gles greater half the sum hypothenuse JEREMIAH DAY length less line of chords line of numbers lines of sines loga logarithmic sine logarithmic TANGENT metical Mult multiplied natural number natural sines number of degrees opposite angles perpendicular positive proportion quadrant quotient radix right angled triangle rithms root secant similar triangles sine of 30 sines and cosines slider square subtracting tables tabular radius tabular sine tangent of half theorem transverse distance triangle ABC trigonometrical tables Trigonometry versed sine vulgar fraction
Popular passages
Page 68 - 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 42 - ... the square of the hypothenuse is equal to the sum of the squares of the other two sides.
Page 105 - 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 49 - ... at the head of the column, take the degrees at the top of the table, and the minutes on the left; but if the title be at the foot of the column, take the degrees at the bottom, and the minutes on the right.
Page 39 - With these the learner should make himself perfectly familiar. 82. The SINE of an arc is a straight line drawn from one end of the arc, perpendicular to a diameter which passes through the other end. Thus BG (Fig.
Page 116 - 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. By Theorem II. we have a : b : : sin. A : sin. B.
Page 37 - The periphery of every circle, whether great or small, is supposed to be divided into 360 equal parts called degrees, each degree into 60 minutes, each minute into 60 seconds, each second into 60 thirds, &c., marked with the characters °, ', ", '", &c. Thus, 32° 24...
Page 72 - ... angle. The third angle is found by subtracting the sum of the other two from 180° ; and the third side is found as in Case I.