Shapes do not always have lines of symmetry. For example, if you have an irregular shape, it will not have a line of symmetry. I am quite certain though that all geometric shapes have a line of symmetry.
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A parallelogram does not have a line of symmetry.
The letters S and N have point symmetry but not line symmetry.
draw line of symmetry for 20
square
What is axis of symmetry? the axis of symmetry is a line that divides a planar figure into two congurent reflected halves