document.write( "Question 96836: Please help me solve this trigo problem.
\n" ); document.write( "A parcel of land has sides measuring 175 ft., 234 ft., 295 ft. ,and 415 ft.
\n" ); document.write( "and the angle between the sides of lengths 234 ft. and 295 ft. has measure
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Algebra.Com's Answer #70493 by Edwin McCravy(20056)\"\" \"About 
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Please help me solve this trigo problem.
\n" ); document.write( "A parcel of land has sides measuring 175 ft., 234 ft., 295 ft. ,and 415 ft.
\n" ); document.write( "and the angle between the sides of lengths 234 ft. and 295 ft. has measure
\n" ); document.write( "137.1 deg. What is the measure of the angle opposite this angle, to the
\n" ); document.write( "nearest tenth of a degree?
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document.write( "Draw in diagonal AC.\r\n" );
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document.write( "Find the length of diagonal AC by using the law of cosines in\r\n" );
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document.write( "AC² = AD² + CD² - 2·AD·CD·cos(D)\r\n" );
document.write( "AC² = 295² + 234² - 2·295·234·cos(137.1°)\r\n" );
document.write( "AC² = 242915.8726\r\n" );
document.write( "AC = 492.8649539\r\n" );
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document.write( "Now use the law of cosines in triangle ABC to find angle B, \r\n" );
document.write( "the desired angle.\r\n" );
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document.write( "cos(B) = \"%28AB%5E2%2BBC%5E2-AC%5E2%29%2F%282%2AAB%2ABC%29\"\r\n" );
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document.write( "cos(B) = \"%28415%5E2%2B175%5E2-242915.8726%29%2F%282%2A415%2A175%29\"\r\n" );
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document.write( "cos(B) = -0.2758407752\r\n" );
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document.write( "Use inverse cosine to find angle B\r\n" );
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document.write( "    B = 106.0121251°\r\n" );
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document.write( "To the nearest tenth of a degree\r\n" );
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document.write( "    B = 106.0°\r\n" );
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document.write( "Edwin
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