document.write( "Question 999906: Triangle ABC has side a = 11, b = 14
\n" ); document.write( "and c = 17.\r
\n" ); document.write( "\n" ); document.write( "Find the measure of angle A to the nearest whole number.
\n" ); document.write( "

Algebra.Com's Answer #617502 by MathLover1(20855)\"\" \"About 
You can put this solution on YOUR website!
Triangle ABC has side \"a+=+11\",\"+b+=+14\" and \"c+=+17\".\r
\n" ); document.write( "\n" ); document.write( "use The Law of Cosines (also called the Cosine Rule)\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "\"a%5E2=c%5E2%2Bb%5E2+-2bc%2Acos%28A%29\"\r
\n" ); document.write( "\n" ); document.write( "\"2bc%2Acos%28A%29=c%5E2%2Bb%5E2-a%5E2\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28A%29=%28c%5E2%2Bb%5E2-a%5E2+%29%2F2bc\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28A%29=%2817%5E2%2B14%5E2-11%5E2+%29%2F%282%2A14%2A17%29\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28A%29=%28289%2B169-121+%29%2F476\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28A%29=%28337+%29%2F476\"\r
\n" ); document.write( "\n" ); document.write( "\"cos%28A%29=0.7079831932773109\"\r
\n" ); document.write( "\n" ); document.write( "\"A=cos%5E%28-1%29%280.7079831932773109%29\"\r
\n" ); document.write( "\n" ); document.write( "\"A=40.1192\"°\r
\n" ); document.write( "\n" ); document.write( "\"A=40\"°\r
\n" ); document.write( "
\n" ); document.write( "\n" ); document.write( "
\n" ); document.write( "
\n" );