Area & perimeter of rectangles - common core aligned! A complete unit with instruction to the student, practice problems, and word problems. Students find perimeters of polygons, including finding the perimeter when the side lengths are given, and finding an unknown side length when the perimeter is given. They learn about area, and how to measure it in either square inches, square feet, square centimeters, square meters, or just square units if no unit of length is specified. Students also re