ONE
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There are infinitely many lines of symmetry. Every line can be a line of symmetry for a suitable shape.
There are 3 lines of symmetry ina 6-sided shape.
If the figure is an image of a real heart, then there are no lines of symmetry. If it is an idealised heart, then 1.
2
Normally none unless it in the shape of a rectangle which has 2 lines of symmetry