Which formula is used to determine the area of a rectangle?

The formula used to determine the area of a rectangle is the product of its length and width. This formula reflects the fundamental concept of area, which is defined as the amount of space enclosed within the boundaries of a two-dimensional shape.

In a rectangle, the length refers to one of its longer sides, while the width refers to one of its shorter sides. When you multiply these dimensions together, you effectively calculate how many square units fit inside the rectangle. This makes it easy to quantify the surface area of any given rectangle, regardless of its size.

Other formulas provided in the choices pertain to different geometric shapes or concepts. For instance, the formula involving altitude and base is used for calculating the area of a triangle, while πr² represents the area of a circle, and r²h expresses the volume of a cylinder. These illustrate how area calculations vary depending on the shape being analyzed, emphasizing the importance of using the correct formula for the specific context.