document.write( "Question 1169134: 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 #793766 by ikleyn(52788) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "

\r\n" );
document.write( "\r\n" );
document.write( "The largest angle is opposite to the longest side, which is 8 cm long.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Use the Cosine law\r\n" );
document.write( "\r\n" );
document.write( "    8^2 = 6^2 + 7^2 - 2*6*7*cos(x)\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "From this equation,\r\n" );
document.write( "\r\n" );
document.write( "    cos(x) =  = 0.25.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Therefore,  x = arccos(0.25).\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Use your calculator.\r\n" );
document.write( "

\r
\n" ); document.write( "\n" ); document.write( "Solved.\r
\n" ); document.write( "
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "

\n" );