When you rotate a shape less than 360 degrees it will look the same. for example a square has rotational symmetry of 4 because it can be reotated 4 time (over 90 degrees) and it will look the same.
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Equilateral triangles have rotational symmetry.
none shapes have 1 rotational symmetry because in rotational symmetry one is none
A parallelogram has a rotational symmetry of 2!
Yes is a rotational symmetry 180 degree it will look like these
A matchbox is rectangular in shape. A rectangle has 2 lines of rotational symmetery. So, a matchbox has 2 lines of rotational symmetry.