In general, a triangle can have 0, 1 or 3 lines of symmetry.
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Four.
A triangle has got 3 sides to it & that's why it's called a triangle. Three sides.
If you mean "Does it have a rotational symmetry", the answer is "Yes." there is a 180 degree rotational symmetry.
5... base and one triangle on each side
Reflectional symmetry