Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 208
l. Let us suppose that we have measured the base line, andthe two angles of elevation, and (AB = 975 yards,A■= 15° 36,BBC = 27° 29;required the altitude BC. First: ABB = BBC- A = 27° 29 - 15° 36 = 11° 53 In the triangle ABB, to find BD.As sin B 11° 53 ar. comp. sin A 15° 30 ... AB 975 ... BB 1273.3… … 5%=5=-
Geometry · Plane trigonometry
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