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It is a line through the point of symmetry. In general it is not an axis of symmetry.
false
rectangle
No, a triangle does not have point symmetry. Point symmetry occurs when an object or shape remains the same after being rotated 180 degrees around a central point. In the case of a triangle, it does not have point symmetry because it does not look the same after a 180-degree rotation.
Abelian meaning commutative. If the symmetry group of a square is commutative then it's an abelian group or else it's not.