What is the area of a rectangular piece of material measuring 4 feet by 10 feet?

To determine the area of a rectangular piece of material, the formula used is length multiplied by width. In this case, the length of the rectangle is 10 feet and the width is 4 feet. When you perform the calculation:

Area = Length × Width

Area = 10 feet × 4 feet = 40 square feet

This calculation reveals that the area of the rectangle is indeed 40 square feet, which corresponds to the correct answer choice. Understanding and applying the area formula is essential in various practical scenarios, such as when working with materials in industrial settings, where accurate measurements are crucial for tasks like cutting or fitting pieces together.