document.write( "Question 256162: Is a triangle a right, acute, or an obtuse triangle if has the measures 11, 11, and 15? \n" ); document.write( "
Algebra.Com's Answer #188342 by Edwin McCravy(20056)\"\" \"About 
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Is a triangle a right, acute, or an obtuse triangle if
\n" ); document.write( "has the measures 11, 11, and 15?
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document.write( "The only angle that could be obtuse or right in any triangle\r\n" );
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document.write( "Let a = 15, b= 11, c = 11, then A is the angle opposite the \r\n" );
document.write( "longest side 15 \r\n" );
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document.write( "\"cos%28A%29+=+%28b%5E2%2Bc%5E2-a%5E2%29%2F%282bc%29\"\r\n" );
document.write( "\"cos%28A%29+=+%2811%5E2%2B11%5E2-15%5E2%29%2F%282%2811%29%2811%29%29\"\r\n" );
document.write( "\"cos%28A%29+=+.0702479339\"\r\n" );
document.write( "\"A=%2285.97177216%B0%22\"\r\n" );
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document.write( "That's less than 90°, so it's acute!  Thus the triangle\r\n" );
document.write( "is an acute triangle.\r\n" );
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document.write( "Edwin

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