Another isometric transformation, a glide reflection, is a composition of a reflection and a translation. 

• A Interactive button. Assistance may be required. ___?___ reflection can be described as a mirror image.
• A Interactive button. Assistance may be required. ___?___ translation can be described as a slide.
  

   

• Lines l and m are perpendicular.
  
  
• In the first example, pre-image Z is Interactive button. Assistance may be required. ___?___ reflected over line m.
• Image Z' is Interactive button. Assistance may be required. ___?___ translated along line m.
• In the second example, pre-image Z is Interactive button. Assistance may be required. ___?___ translated along line m.
  
• Image Z' is Interactive button. Assistance may be required. ___?___ reflected over line m.

Both examples show that pre-image Z is reflected and translated, creating a composition of two basic transformations.

• A glide reflection is the transformation created when a pre-image is reflected and translated over perpendicular lines.

A real world example:

• Each footprint is a reflection of the print made by the opposite foot translated one step forward. 
  
  
• The composition of a reflection and a translation is a Interactive button. Assistance may be required. ___?___ glide reflection .