This math topic focuses on calculating the area of non-right triangles by relating them to the areas of surrounding rectangles. The method practiced involves finding the area of the rectangle first and then halving it to arrive at the area of the enclosed triangle. Each problem presents a visual representation of a rectangle with a triangle inside, prompting learners to apply the halving method to determine the triangle's area. The problems vary in complexity and provide multiple choice answers, enhancing understanding of area calculations in different geometrical contexts.