Nothing has 1 order of rotational symmetry because in rotational symmetry 1 is none.
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These are also known as asymmetric shapes.
It has 1 order of rotational symmetry.
Not necessarily, except rotational symmetry of order 1.
If the leaf stem is present, it has symmetry of order 1. Otherwise, it can have rotational symmetry of order 3.
i am not sure but i think a trapezium has 1 order of rotational symmetry