Lesson: Perimeter of Rectangles and Squares Elementary School • Mathematics • 4th Grade • Elementary School • Mathematics • 3rd Grade • Holt Mathematics • Course 2 • Glencoe • Geometry • Glencoe • Algebra 1 • Prentice Hall • Geometry • Common Core • Glencoe • Geometry • Common Core • Math Connects • Concepts, Skills, and Problem Solving • Course 2 • Student Edition • Math Connects • Concepts, Skills, and Problem Solving • Course 1 • Student Edition