1. **State the problem:** Calculate the area of a parallelogram with base length $8$ cm and height $9$ cm. 2. **Formula:** The area $A$ of a parallelogram is given by: $$A = \text{base} \times \text{height}$$ 3. **Explanation:** The base is the length of one side of the parallelogram, and the height is the perpendicular distance between the base and the opposite side. 4. **Substitute values:** Here, base $= 8$ cm and height $= 9$ cm. 5. **Calculate:** $$A = 8 \times 9 = 72$$ 6. **Answer:** The area of the parallelogram is $72$ square centimeters.