This math topic focuses on calculating the area of rectangles that surround right triangles. It introduces the concept of transitioning from understanding the area of a rectangle to applying those principles to the area of a triangle. Each problem presents an image of a rectangle encapsulating a triangle, and learners are tasked to compute the area of the rectangle. Multiple-choice answers are provided for each question, reinforcing the practical application of the formula for the area of a rectangle in various contexts and units (cm, m, in). This is part of a broader introduction to understanding triangle areas.