An equilateral triangle has three axes of symmetry. Each axis of symmetry passes through a vertex and the midpoint of the opposite side. This is because all sides and angles of an equilateral triangle are equal, making it highly symmetrical.
On the other hand, an isosceles triangle that is not equilateral has only one axis of symmetry. This axis of symmetry passes through the vertex angle (the angle between the two equal sides) and the midpoint of the base (the side that is not equal to the other two). Since only two sides are equal in an isosceles triangle, it has less symmetry compared to an equilateral triangle.