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    1 ##DESCRIPTION
    2 ## Algebra: Trigonometry of right triangles
    3 ##ENDDESCRIPTION
    4 
    5 ##KEYWORDS('algebra', 'trigonometry', 'The law of cosines')
    6 
    7 ## tcao , PAID on 11-24-2003
    8 
    9 ## DBsubject('Trigonometry')
   10 ## DBchapter('Trigonometric Functions of Angles')
   11 ## DBsection('The Law of Cosines')
   12 ## Date('6/3/2002')
   13 ## Author('')
   14 ## Institution('')
   15 ## TitleText1('Precalculus')
   16 ## EditionText1('3')
   17 ## AuthorText1('Stewart, Redlin, Watson')
   18 ## Section1('6.5')
   19 ## Problem1('3')
   20 DOCUMENT();        # This should be the first executable line in the problem.
   21 
   22 loadMacros(
   23 "PG.pl",
   24 "PGbasicmacros.pl",
   25 "PGchoicemacros.pl",
   26 "PGanswermacros.pl",
   27 "PGauxiliaryFunctions.pl"
   28 );
   29 
   30 TEXT(beginproblem());
   31 $showPartialCorrectAnswers = 0;
   32 
   33 
   34 TEXT(EV2(<<EOT));
   35 $BBOLD Click on the graph to view a larger graph$EBOLD
   36 $BR
   37 Use the Law of Cosines to find the indicated angle \(x\) given in the graph
   38 $PAR \{ image("c6s5p5.gif") \} $PAR
   39 $BR
   40 \(x=\) \{ans_rule(10)\} degrees;
   41 $BR
   42 EOT
   43 
   44 $ans1=arccos((68.01*68.01+42.15*42.15-37.83*37.83)/(2*68.01*42.15))*180/$PI;
   45 ANS(num_cmp($ans1));
   46 
   47 ENDDOCUMENT();        # This should be the last executable line in the problem.