This math topic focuses on calculating the perimeter of rectangles using given coordinates on a Cartesian grid. The coordinates provided are positive, and the practice is involved with interpreting these coordinates from diagrams to determine the lengths of the sides of rectangles. Each problem presents a visual representation (a grid with marked points), and the task is to calculate the perimeter based on the rectangle's dimensions derived from these points. This is a practical application of both geometry and logical reasoning within the Cartesian coordinate system.