Think of the line of symmetry as a mirror (indeed try using a small hand rectangular hand mirror). a symmetry either side of a line is like a reflection of one side in the mirror.
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A square has exactly four lines of symmetry.
yes
If the figure is an image of a real heart, then there are no lines of symmetry. If it is an idealised heart, then 1.
Equilateral Triangles (3 lines of symmetry)Rectangles (at least 2 lines of symmetry)Squares (4 lines of symmetry)Rhombuses (at least 2 lines of symmetry)Any regular polygon (at least 5 lines of symmetry)
A regular hexagon has six lines of symmetry. Lines of symmetry are imaginary lines where you can fold a figure or image and both halves are identical matches.