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Engineering Aid 1 - Advanced Structural engineering guide book
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. You can compute the length of BC by (1) solving The sum of the angles that make up each of the overlapping triangles within the quadrilateral is as follows: The sum of the closing errors for the four triangles is  (09  +  01  +  07  +  01),  or  18  seconds.  The  average triangle closure for the four triangles, then, is 18/4, or 04.5  seconds.  For  third-order  triangulation,  the maximum  average  triangle  closure  is  05  seconds; therefore,  for  the  third-order  work  this  closure  would be  acceptable. Base  Line  Discrepancy If AD is the base line in figure 15-28, then BC would be the adjacent baseline.                       assume that the baseline AD measures 700.00 feet and compute the length of BC on the basis of the angles we have adjusted. These angles now measure as follows: The  natural  sine  of  each  of  these  angles  is  as follows: triangle  ABD for AB and triangle  ABC for BC and (2) solving triangle  ACD for DC and triangle DBC for BC. Using the law of sines and solving triangle  ABD for side AB, we have Solving triangle  ABC for side BC, we have Solving triangle  ACD for side CD, we have Solving triangle  DBC for side BC, we have 15-38







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