document.write( "Question 1197887: In a triangle ABC with side a=6, side b=8, side c= 13, what the measure of angle C? \n" ); document.write( "
Algebra.Com's Answer #831355 by MathLover1(20850)\"\" \"About 
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\n" ); document.write( "\n" ); document.write( "use the law of cosines \r
\n" ); document.write( "\n" ); document.write( "\"cos%28C%29+=+%28a%5E2+%2B+b%5E2+-+c%5E2%29%2F%282ab%29\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28C%29+=+%286%5E2+%2B+8%5E2+-+13%5E2%29%2F%282%2A6%2A8%29\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28C%29+=+-69%2F96\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28C%29+=+-23%2F32\"\r
\n" ); document.write( "\n" ); document.write( "\"C+=+cos%5E-1%28-23%2F32%29\"\r
\n" ); document.write( "\n" ); document.write( "\"C+=+2.3727991\" rad. or \"C+=+136\"°\r
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