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The supplementary angle of the triangle.
Any number between 3 and 15
Any number between 8-16 If you do 12+5=17 the other side can't be 17 because then the triangle would be flat so it's any number lower than 17. Also, 12-5= 7. Again, 7 can't be the third side of this traingle because it would make the triangle flat. so any number higher than 7 would work.
Assuming you mean the third angle of a triangle... 64 degrees.