In the given options the isosceles triangle has just one line of symmetry, this is not the correct option.
Acute triangle doesn't always have more than one line in symmetry, it could be in particular cases but not always.
Scalene triangle has no line of symmetry.
And equiangular triangle also have equal sides, then it is an equilateral triangles, those always have 3 lines of symmetry, thus An equiangular triangle always has more than one line in symmetry.