First Part of an Elementary Treatise on Spherical Trigonometry1836 - Spherical trigonometry - 71 pages |
From inside the book
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Page
... leg are known ( 566 ) , ( 567 ) , ( 569 ) , when a leg and the opposite angle are known ( 572 ) , ( 574 ) , ( 575 ) , · when a leg and the adjacent angle are known ( 585 ) , ( 586 ) , ( 588 ) , when the two legs are known ( 589 ) ...
... leg are known ( 566 ) , ( 567 ) , ( 569 ) , when a leg and the opposite angle are known ( 572 ) , ( 574 ) , ( 575 ) , · when a leg and the adjacent angle are known ( 585 ) , ( 586 ) , ( 588 ) , when the two legs are known ( 589 ) ...
Page 2
... legs BC and AC , opposite the angles A and B , 04 respectively a and b . Let O be the centre of the sphere . Join OA , OB , OC . A B B 2 a The angle A is , by art . 2 , equal to the angle of the planes BOA and COA . The angle B is equal ...
... legs BC and AC , opposite the angles A and B , 04 respectively a and b . Let O be the centre of the sphere . Join OA , OB , OC . A B B 2 a The angle A is , by art . 2 , equal to the angle of the planes BOA and COA . The angle B is equal ...
Page 7
... legs , the complement of the hypothenuse and the complements of the angles ; either part may be called the middle part . The two parts , including the middle part on each side , are ( 478 ) called the adjacent parts ; and the other two ...
... legs , the complement of the hypothenuse and the complements of the angles ; either part may be called the middle part . The two parts , including the middle part on each side , are ( 478 ) called the adjacent parts ; and the other two ...
Page 10
... legs a and b must , by the following Lemma ( 496 ) , be both greater or both less than 90 ° . But when his greater than 90 ° , the first member of ( 492 ) is by ( 496 ) negative ; and therefore one of ( 494 ) the factors of the second ...
... legs a and b must , by the following Lemma ( 496 ) , be both greater or both less than 90 ° . But when his greater than 90 ° , the first member of ( 492 ) is by ( 496 ) negative ; and therefore one of ( 494 ) the factors of the second ...
Page 11
... legs , the case of either side equal to 90 ° being excepted . Demonstration . The factors cos . a and cos . b of the second member of the above equation are , by ( 5 ) , fractions whose numerators are less than their denom- inators ...
... legs , the case of either side equal to 90 ° being excepted . Demonstration . The factors cos . a and cos . b of the second member of the above equation are , by ( 5 ) , fractions whose numerators are less than their denom- inators ...
Other editions - View all
First Part of an Elementary Treatise on Spherical Trigonometry (Classic Reprint) Benjamin Peirce No preview available - 2017 |
First Part of an Elementary Treatise on Spherical Trigonometry Benjamin Peirce No preview available - 2016 |
Common terms and phrases
୦୯ A'BC AC the perpendicular adjacent angles angle are known angles are given angles respectively equal AP and PC ar.co B'OC Corollary cosec cotan Demonstration differs from 90 equal to 90 fall on AC given angle given sides given value greater than 90 h tang half the sum Hence hypothenuse included angle legs are known Lemma less than 90 Let ABC fig let fall logarithm lunary surface means of 496 middle Napier's Rules negative obtuse opposite angle opposite side perpendicular BP perpendicular to OA planes BOC Problem quotient right angle right triangle fig right triangle PBC Scholium second member Secondly side BC sides and angles sides equal Solution of Spherical solve a spherical solve the triangle Spherical Oblique Triangles spherical right triangle spherical triangle ABC SPHERICAL TRIGONOMETRY substituted surface ABC tang.C tangent of half Thirdly trian triangle ABC figs
Popular passages
Page 1 - A spherical triangle is a portion of the surface of a sphere, bounded by three arcs of great circles.
Page 69 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. D c A' D' Hyp. In triangles ABC and A'B'C', ZA = ZA'. To prove AABC = ABxAC. A A'B'C' A'B'xA'C' Proof. Draw the altitudes BD and B'D'.
Page 69 - THEOREM. The surface of a spherical triangle is measured by the excess of the sum of its three angles above two right angles, multiplied by the tri-rectangular triangle.
Page 8 - I. The sine of the middle part is equal to the product of the tangents of the adjacent parts.
Page 8 - II. The sine of the middle part is equal to the product of the cosines of the opposite parts.
Page 30 - Any angle is greater than the difference between 180° and the sum of the other two angles.
Page 63 - The cosine of half the sum of two sides of a spherical triangle is to the cosine of half their difference as the cotangent of half the included angle is to the tangent of half the sum of the other two angles. The sine of half the sum of two sides of a spherical...
Page 62 - The sine of half the sum of two sides of a spherical triangle is to the sine of half their difference as the cotangent of half the included angle is to the tangent of half the difference of the other two angles.
Page 71 - ... and the sum of the angles in all the triangles is evidently the same as that of all the angles of the polygon ; hence, the surface of the polygon is equal to the sum of all its angles, diminished by twice as many right angles as it has sides less two, into the tri-rectangular triangle.