A rotation through 180 degrees.
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It means that if you flip the figure over, you get the same figure again.
They are alike because when you flip a figure you flip it on the line of symmetry am i right i am in 5th grade i was looking for the answer not answering.
You can always slide and flip any figure that you want to. But that will not make them the same.
Only one point. A dimensionless figure.
draw line down the middle and fold over without overlap or point mirror down centre point and see if there is same shape