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Determination of Angle from Three Known Sides
HINTS  ON  COMPUTING

Engineering Aid 3 - Beginning Structural engineering guide book
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Trigonometric Determination of Area If you know all three sides of a triangle, you can determine the area by applying the following formula: Where  s  =  1/2  perimeter  of  a  triangle For the triangle shown in figure 1-30, the area computation  is When  you  know  two  sides  of  a  triangle  and the   angle   included   between   them,   you   can determine the area by applying, appropriately, one of  the  following  formulas: In  figure  1-31,  two  sides,  b  =  13.00  ft  and c  =  9.00  ft,  and  the  included  angle,  A  =  40°00´, are given. The sine of 40°00´ is 0.64279. The area computation  is  as  follows: Figure 1-31.-Area of a triangle with two sides and one angle Figure  1-32.-Scientific  pocket  calculator. SCIENTIFIC POCKET CALCULATOR Figure   1-32   illustrates   a   typical   pocket calculator that replaces the slide rule, logarithm tables,   and   office   adding   machine.   This   tool, packed with the latest in state-of-the-art solid-state technology,  is  a  great  asset  for  our  trade.  With it  we  can  handle  many  problems  quickly  and accurately without having to hassle with lengthy, tedious  computations.  This  tool  should  serve  us faithfully for a long time if we treat it with respect and  care. Today’s  hand-held  calculators  have  become an   everyday   part   of   our   lives.   Rugged   and inexpensive,  they’re  a  practical  answer  to  the  real need we all have for quick, accurate calculations. THE  KEYBOARD Your  calculator  has  many  features  to  make calculations  easy  and  accurate.  To  allow  you  to use  all  of  these  features  without  crowding  the keyboard,  the  designer  has  caused  some  of  the keys to have more than one function. If you look closely  at  the  keyboard,  you’ll  notice  that  the  keys in the column on the left side have two function symbols.  These  keys  are  called  dual-function  keys because they perform two functions. If you want given. 1-25







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