document.write( "Question 115249: The lengths of the sides of triangle ABC are AB=6, BC=4, and CA=5, then cos A=? \n" ); document.write( "

Algebra.Com's Answer #83833 by Edwin McCravy(20056) $\"\"$ $\"About$

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\n" ); document.write( "The lengths of the sides of triangle ABC are AB=6, BC=4, and CA=5, then cos A=?
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document.write( "The law of cosines for when you have all three sides and\r\n" );
document.write( "no angle given is\r\n" );
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document.write( "                 (one ADJACENT side)² + (other ADJACENT side)² - (OPPOSITE)²\r\n" );
document.write( "cosine(ANGLE) = -------------------------------------------------------------\r\n" );
document.write( "                      2(one ADJACENT side)(other ADJACENT side)\r\n" );
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document.write( "The ANGLE we want to find the cosine of is A.\r\n" );
document.write( "One ADJACENT side to angle A is AB which is 6 in length.\r\n" );
document.write( "The other ADJACENT side to angle A is CA which is 5 in length.\r\n" );
document.write( "The OPPOSITE side is the side across the triangle\r\n" );
document.write( "from angle A, which is BC, 4 in length.\r\n" );
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document.write( "Edwin

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