an isosceles
It depends. If it is a right isosceles triangle, it has one axis of symmetry (the line which would bisect the right angle). A right scalene triangle has no axis of symmetry.
You are an isosceles triangle
An isosceles triangle
there is one
3 is how many lines of symmetry a triangle has.
3(one per corner)
Any isosceles triangle which is not also an equilateral triangle. An equilateral triangle would have three.
A scalene triangle has no axis of symmetry.
Isosceles
An equilateral triangle has 3 lines of symmetry
A triangle, in general has none. An isosceles triangle has 1 axis of symmetry while an equilateral triangle has 3 axes.
This could be either an isosceles triangle or a right angled triangle.