1. **Problem Statement:** Calculate the area of a rectangular room. 2. **Formula:** The area $A$ of a rectangle is given by the formula: $$A = \text{length} \times \text{width}$$ 3. **Explanation:** To find the area, multiply the length of the room by its width. Both measurements should be in the same units (e.g., meters). 4. **Example:** Suppose the room is 5 meters long and 4 meters wide. 5. **Calculation:** $$A = 5 \times 4 = 20$$ 6. **Answer:** The area of the room is 20 square meters. This method works for any rectangular room by substituting the length and width values.