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A line of symmetry
Symmetry is dividing a shape or figure in a certain way so that both sides are the same. Usually the line of symmetry, the line separating the shape, is a straight line.
square and Equilateral Trangle
An image has Reflectional Symmetry if there is at least one line which splits the image in half so that one side is the mirror image of the other. Reflectional symmetry is also called line symmetry or mirror symmetry because there is a line in the figure where a mirror could be placed, and the figure would look the same.
all equilateral shapes do. that means that all sides are the same length.