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A (non-degenerate) triangle with integer sides has perimeter 12. How many such non-congruent triangles are there?
 Aug 17, 2017
 #1
avatar+98197 
+2

 

No side can be < 2  or > 5

 

Here are the possibilities  for the sides :

 

 2 5 5     3 4 5      4 4 4

 

 

cool cool cool    

 Aug 17, 2017

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