There are infinitely many possible answers. It could be a triangle or an equiangular hexagon with alternate sides of length a and b, or an equiangular nonagon with sides of length a, b and c, ... etc. Or any fractal based on a triangle.
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Scalene triangle * * * * * A scalene triangle does not have rotational symmetry of order 3. The triskelion (the three legs) on the Isle of Man flag, or a simplified version of that shape will meet the requirements.
The triskelion (the three legs) on the Isle of Man flag.
An equilateral triangle has rotational symmetry (order 3).
If the leaf stem is present, it has symmetry of order 1. Otherwise, it can have rotational symmetry of order 3.
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