How many lines of reflective symmetry does an equilateral triangle have

From top to bottom or from side to side?

The answer is 3.

Step-by-step explanation:

We can say that a shape has reflective symmetry, when that shape is reflected in a line of symmetry or a mirror line. The reflected shape will be exactly the same as the original shape.

So, an equilateral triangle has three lines of symmetry. An equilateral triangle has 3 equal sides, so it has 3 lines of reflective symmetry.