That's easy! NONE!
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There are no lines of symmentry in a scalene triangle. If you were to put a line anywhere in a scalene triangle, the two sides would not be symmetrical because scalene triangle has all different sides and all different angles.
0 lines of symmetry
None
usually none
Depending on the triangle:A scalene triangle has no lines of symmetry.An isosceles triangle has 1 (one) line of symmetry.An equilateral triangle has 3 (three) lines of symmetry.