One, except in the special case where the triangle is also equilateral (in which case, three).
An isosceles triangle definitely has three axes of symmetry
It has just one line of symmetry
A triangle, in general has none. An isosceles triangle has 1 axis of symmetry while an equilateral triangle has 3 axes.
3
threethere are 3 axes of semmetry in a equilateeral triangle
One
3
two
one
3
0An equilateral triangle has 3An isoceles triangle has 1All other triangles have 0
That will depend on what type of triangle it is because an equilateral triangle has 3 lines of symmetry whereas an isosceles triangle has only 1 line of symmetry but a scalene triangle has no lines of symmetry.