Answers

1. It is a triangle because it is a closed figure with three sides.
2. It is not a triangle because it has four sides.
3. It is not a triangle because it has four sides.
4. It is a triangle because it is a closed figure with three sides.
5. It is not a triangle because it has 6 sides.
6. It is a triangle because it is a closed figure with three sides.
7. It is not a triangle because it is not a closed figure.

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