## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

perimeter = $4s$
A square is a 4-sided figure where all 4 sides are equal in length. The perimeter of a square is the sum of the lengths of the sides. If the side of a square has a length of s the sum of the lengths of the 4 sides is then $s+s+s+s$ or $4s$.