document.write( "Question 1205897: Sides of a triangle are 8,11,13.find the largest angle of the triangle
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Algebra.Com's Answer #842982 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "The largest angle is opposite to the longest side, which is 13 units long.\r\n" );
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document.write( "Write the cosine law equation\r\n" );
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document.write( "    13^2 = 8^2 + 11^2 - 2cos(a)*8*11,\r\n" );
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document.write( "where \"a\" is the angle between the sides 8 and 11 units long.\r\n" );
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document.write( "You get then\r\n" );
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document.write( "    cos(a) =  =  = .\r\n" );
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document.write( "Hence,  a =  = 1.479761549 radians = 84.7840914 degrees.    ANSWER\r\n" );
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