This math topic focuses on using the Cartesian grid to solve geometry problems involving rectangles. It primarily challenges students to calculate either the width or height of rectangles given their perimeters. The problems are basic yet engaging, involving positive numbers only, and are suited for introductory learning in Cartesian grid geometry logic. The exercises require understanding rectangular dimensions and applying perimeter formulas in a visual context with diagrams provided for each question. Each question is presented as a multiple-choice problem, with several potential dimensions listed as options.