document.write( "Question 967028: A triangle has sides of length 2 cm, 8 cm and 9 cm.
\n" ); document.write( "Calculate the value of the largest angle in this triangle. \n" ); document.write( "

Algebra.Com's Answer #591020 by Fombitz(32388) $\"\"$ $\"About$

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Use the law of cosines,
\n" ); document.write( " $\"9%5E2=2%5E2%2B8%5E2-2%282%29%288%29cos%28theta%29\"$
\n" ); document.write( " $\"81=4%2B64-32cos%28theta%29\"$
\n" ); document.write( " $\"-16cos%28theta%29=13\"$
\n" ); document.write( " $\"cos%28theta%29=-13%2F32\"$
\n" ); document.write( " $\"theta=113.97\"$ \n" ); document.write( "

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