Four.
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In general, a triangle can have 0, 1 or 3 lines of symmetry.
If you mean "Does it have a rotational symmetry", the answer is "Yes." there is a 180 degree rotational symmetry.
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Oh, dude, it's called a diagonal. Yeah, like when you draw a line from one corner to the opposite corner of a square, that's the fancy term for it. It's like the square's way of saying, "I'm not just a boring ol' four-sided shape, I've got some flair with my diagonals."
Well, honey, that sounds like a rectangle to me. It's got those four right angles, two diagonals for days, and don't forget those four axes of symmetry. So, if you're looking for a shape that fits that description, you've hit the jackpot with a good ol' rectangle.