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Yes. What you should watch out for is that, to form a triangle, none of the segments should be longer (or as long as) the other two segments combined. Just check whether the longest segment is longer than the sum of the other two - if it is, then you can't form a triangle.
yes
No. In order for any three line segments to form a triangle, none of them can be greater in length than the sum of the other two.
that's not a triangle
Turn the 7 to form an angle with the other 7. It shapes a triangle.