document.write( "Question 389063: is PQ=25, QR=20 and PR=23, which angle in the triangle is the largest? \n" ); document.write( "

Algebra.Com's Answer #275591 by Fombitz(32388) $\"\"$ $\"About$

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From the law of cosines,
\n" ); document.write( " $\"PQ%5E2=QR%5E2%2BPR%5E2-2%28QR%29%28PR%29cos%28R%29\"$
\n" ); document.write( " $\"cos%28R%29=%28QR%5E2%2BPR%5E2-PQ%5E2%29%2F%282%28QR%29%28PR%29%29\"$
\n" ); document.write( " $\"cos%28R%29=%2820%5E2%2B23%5E2-25%5E2%29%2F%282%2820%29%2823%29%29\"$
\n" ); document.write( " $\"cos%28R%29=304%2F920\"$
\n" ); document.write( " $\"cos%28R%29=0.3304\"$
\n" ); document.write( " $\"highlight%28R=70.7%29\"$ degrees
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