1. The problem is to express the area of a rectangle using its length $L$ and width $W$. 2. The formula for the area $A$ of a rectangle is: $$A = L \times W$$ 3. This formula means you multiply the length by the width to find the total area. 4. For example, if $L = 5$ and $W = 3$, then: $$A = 5 \times 3 = 15$$ 5. So, the area of the rectangle is 15 square units. This formula works for any rectangle as long as you know the length and width.