What operation is combined with a reflection to create a glide reflection?

A glide reflection is a specific type of transformation in geometry that consists of a reflection followed by a translation along the direction of the reflection line.

When a figure is reflected over a line, the shape is flipped over that line. To perform a glide reflection, after this reflection, you then move the reflected shape along the line of reflection. This movement is referred to as a translation.

The combination of these two operations - the reflection and the translation - results in the glide reflection, allowing the object to be shifted in a way that maintains its orientation relative to the mirrored position. This is why translation is the correct operation paired with reflection to form a glide reflection.