Maybe yes or no
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no, only equilateral triangles have 3 lines of symmetry
Different triangles may have none, one, or three lines of symmetry.
An equilateral triangle has 3 lines of symmetry whereas an isosceles triangle has 1 line of symmetry but normally no triangles have 2 lines of symmetry.
No such thing as a regular triangle. You need to be more accurate in your triangular description. Equilateral triangle is symmetric about three lines of symmetry. Isosceles triangle is symmetric one line of symmetry. Right-angled, and Scalene triangles have no lines of symmetry.
A right triangle doesn't necessarily have any lines of symmetry. But if it has, it can't have more than one.