When we have a rectangle with a length L and a width W, the product of these two measurements gives us the area of the rectangle. Here are the steps to find it:
1. **Understanding the properties of a rectangle**: A rectangle is a 2-dimensional shape with opposite sides that are equal in length. So it has two lengths (L) and two widths (W).
2. **Formula for the area of a rectangle**: The area of a rectangle is found by multiplying the length by the width. The formula is:
Area = Length × Width
3. **Multiplying**: If we are provided with the values for the length and the width of the rectangle, we need to multiply these two numbers to find the area.
4. **Answer**: The property in question that is found by multiplying the length L by the width W is the "area" of the rectangle.
So, the correct answer from the options listed is:
area
