When you can cut the object in half and it will look like a mirror image of each side.
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The axis of symmetry. Which is a line that you can reflect two functions of off the axis of symmetry.
a line that goes right across
It means the line where if the object is folded,it will line up perfectly
no, a square has 4 if you talk basic math
no matter what is on one side if the shape is symmetrical the other side must be the same