This math topic focuses on understanding and manipulating the properties of rectangles within a Cartesian grid, specifically in terms of calculating perimeters and solving for dimensions. Students tackle problems where they need to determine missing dimensions (either width or height) of rectangles given their perimeters, which are exercises in algebraic reasoning and geometry. The problems all assume positive dimensions for simplification and better foundational learning. This activity helps in enhancing students' skills in using formulas and equations related to rectangles, while also providing a basis for more complex geometry concepts.