Only an equilateral triangle has rotational symmetry.
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Both.
Yes. Any equilateral shape can have both rotational and line symmetry.
The heart does have both symmetries. it can be split through the middle and rotated 4 times to make rotational symmetry
3 of each
The letters: I O H X o x all exhibit bilateral symmetry and rotational symmetry, with O and X exhibiting it in both upper and lower case.