What is the perimeter of an equilateral triangle with each side equal to 5?

As an ASVAB tutor, I place a great emphasis on geometry.  In order to help my students to review ASVAB math, I remind my students of the need to know the numerous formulas for area, circumference, volume and surface area.  I tell them they need to know how to figure out the perimeter of all the shapes.  Knowing perimeter formulas for all the shapes is not necessary.  I remind my students they need to know how to find perimeter but formulas are not needed.  Do you know how to find the perimeter of an equilateral triangle?  The answer will be presented tomorrow.