document.write( "Question 200809: How many distinct triangles have a perimeter of 15 units and integral length sides? \n" ); document.write( "
Algebra.Com's Answer #151053 by vleith(2983)\"\" \"About 
You can put this solution on YOUR website!
I'm sure there must be an algebraic way to do this, but for this one, I would just grind through them.\r
\n" ); document.write( "\n" ); document.write( "Start with an equilateral triangle 5,5,5
\n" ); document.write( "Now take one unit from one side and add it another side, 4,6,5 or 4.5,6. which leaves unique one of 4,6,5
\n" ); document.write( "Again 3,7,5 or 3,6,6
\n" ); document.write( "Again 2,8,5 or 2,7,6 or 2,7,6 or 2,7,6 which leaves just 2,8,5 and 2,7,6
\n" ); document.write( "Again 1,9,5 or 1,8,6 or 1,7,7\r
\n" ); document.write( "\n" ); document.write( "So we have 7 possibilites. Look at the possible answers and make sure that for each, the sum of any two sides is greater than the remaining side.\r
\n" ); document.write( "\n" ); document.write( "1,9,5 won't work since 1+5 <9
\n" ); document.write( "Likewise 2,8,5 wont work since 2+5<8\r
\n" ); document.write( "\n" ); document.write( "So I say we have 5 that work
\n" ); document.write( "
\n" );