A treatise on surveying and navigation: uniting the theoretical, practical, and educational features of these subjects (1857)
Robinson, Horatio N[elson], 1806-1867. [from old catalog] · Cincinnati, J. Ernst; Toledo, Anderson, Burr, & co. · leaf 74
m II, the area is\a(AD) (1) The trigometrical value of AD can be found from the rightangled triangle ABD. Thus, sin. ABB : c : : sin. B : AB. That is, 1 : c : : sin. B : AB. Whence AB=c sin. B. This value of AB substituted in (1) gives \ac sin. B= area A (2). This expression is the area of the… … 72 SURVEYING. 1. One side of a triangle is 84 feet, another 90 feet, and theirincluded angle is 27° 31. What is the area ? Ans. 1746.4 square feet.27° 31 Nat. sine. - - - 46201\ac - - - - 3780 3696080323407138603 1746.39780 Ans.When we use logarithms we have the following rule :Rule.— To the…
Surveying · Navigation
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