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An ellipse has rotational symmetry of order 2.
yes, in fact it can have 6 rotational symmetries.
None, however the semicircle has one folding axis of symmetry perpendicular to the midpoint of the straight side
The heart does have both symmetries. it can be split through the middle and rotated 4 times to make rotational symmetry
A parallelogram.A parallelogram.A parallelogram.A parallelogram.