a line that goes right across
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Horizontal only
This is my own definition of horizontal symmetry (no source)- Symmetry to describe a figure that is symmetrical after being reflected over a horizontal line.
Both
3 (w/ horizontal line of symmetry) and 8 (horizontal and vertical).
Only the I has a horizontal line of symmetry. Visualize folding PIZZA in half through the letters. Only the I would fold down perfectly on top of itself, so it has a horizontal line of symmetry.