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Answer:

1

3

6

Step-by-step explanation:

the 2 sides added have to be greater than the hypotunese
1 is a right angle triangle because of the pythagorus theorem
3 is a obtuse scalene triangle
6 is a obtuse scalene triangle
it can’t be the others because the sum of two sides is always greater than the third

(please ask if you want a more detailed explanation)