Assess students' ability to factor and apply area and perimeter formulas by having them design three different rectangles with whole-number side lengths that each have area 36 but different perimeters. Students should draw each rectangle (to scale or clearly labeled), list the side lengths, show calculations for area and perimeter for each, compare the perimeters (identify largest and smallest), and write a brief explanation of why rectangles with the same area can have different perimeters. Appropriate for grades 3–5 (advanced).