I think none. In fact the only triangle that I believe has any rotational symmetry is an equilateral triangle.
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An equilateral triangle has both line symmetry and rotational symmetry. A non-equilateral isosceles triangle has line symmetry but not rotational symmetry. A scalene triangle has neither kind of symmetry.
Yes, an equilateral triangle has rotational symmetry of order 3.
yes it does. It a rotational symmetry of 3
A scalene triangle has one order of rotational symmetry.
An isoceles triangle does not have rotation symmetry