This math topic focuses on calculating the area of a trapezoid by relating it to the area of an equivalent rectangle. The problems are formulated to help understand the concept of finding areas, specifically converting the problem of a trapezoid into that of a rectangle which often involves using the trapezoid area formula indirectly or picturing the trapezoid as part of a rectangle. The questions vary in complexity, and some provide multiple-choice answers that include visual representations in units such as kilometers, meters, centimeters, and inches squared.