document.write( "Question 1209423: the smallest angle of a triangle with sides 9cm, 11cm and 13 cm
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Algebra.Com's Answer #848788 by ikleyn(52786) $\"\"$ $\"About$

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document.write( "In any triangle, the smallest angle is opposite to the shortest side.\r\n" );
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document.write( "In the given triangle, the smallest angle is opposite to the 9 cm side and is\r\n" );
document.write( "concluded between the 11 cm and 13 cm sides.\r\n" );
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document.write( "Write the cosine law for the shortest side of 9 cm\r\n" );
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document.write( "    9^2 = 11^2 + 13^2 - 2*11*13*cos(a)\r\n" );
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document.write( "where \"a\" is the angle under the question.\r\n" );
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document.write( "From this equation,\r\n" );
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document.write( "    cos(a) =  =  =  = 0.730769231.\r\n" );
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document.write( "So, the angle \"a\" is\r\n" );
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document.write( "    a = arccos(0.730769231) = 43.04907978 degrees.    ANSWER\r\n" );
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document.write( "You may round it as you want.\r\n" );
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