A Course On the Solution of Spherical Triangles for the Mathematical Laboratory
A Course On the Solution of Spherical Triangles for the Mathematical Laboratory
Herbert Bell
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(ft) Having first found (or $'), supposing that A and b (or c) are given, we obtain the required fourth part a or c (or b) from equation (a) or (/3).
Similarly for any other equation of group (5).
Example 1. Given & = 49 24' 10"'23, A = 110 51' 14" '84, a = 70 14' 20"'12, find c< 180.
L tan 6 = 10 -0670 102, 5 L cos A = 9-5514 376, Irc Ltan0= 9-6184 478, 6n 6= - 22 33' 25"'66 Lcos6= 9-8134 052, 1 -Lcos&= 0-1865 947, 9 Lcosa= 9-5290 434, 7 L cos 0= 9-9654 357, 2 L cos (e-0)= 9-6810 739, 8 c-6= 61 19' 36" '01 c= 3846'10"-35.
The student should verify the above calculation as far as seven-place tables will permit by using the value of c obtained, together with a and A, to find b.
Example 2. Given a = 31 42' 16"'4, & = 36 17' 10"'0, = 98 12' 40"'0, find c.
(Ans. : 50 6' 24" -0. ) 16 THE SOLUTION OF SPHERICAL TRIANGLES [CH. N 18. Employment of Gaussian Logarithms. By means of the " auxiliary angle " of last section, we can find the value of any one of the four variables of the cosine formula when the other three are given.
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