document.write( "Question 1101467: Find the largest angle in a triangle with sides 6.0 cm, 7.0 cm, and 8.0 cm. \n" ); document.write( "

Algebra.Com's Answer #716060 by ikleyn(52787) $\"\"$ $\"About$

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\n" ); document.write( "Find the largest angle in a triangle with sides 6.0 cm, 7.0 cm, and 8.0 cm.
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document.write( "The angle opposite the largest side is the largest angle.\r\n" );
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document.write( "a^2 = b^2 + c^2 - 2bc*Cos(A)\r\n" );
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document.write( "Cos(A) = [b^2+c^2-a^2]/(2bc)\r\n" );
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document.write( "Cos(A) = (6^2+7^2-8^2)/(2*6*7) = .\r\n" );
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document.write( "A = arccos(1/4) =   75.56 degrees (approximately).\r\n" );
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