9. Use three rectangles to form a larger rectangle (without gaps or overlaps), where two of the rectangles are $3 \mathrm{~cm} \times 8 \mathrm{~cm}$ and $2 \mathrm{~cm} \times 5 \mathrm{~cm}$, respectively. The dimensions of the third rectangle can be $\qquad$ kinds.
【Answer】4
【Analysis】Exam Point: Figure Cutting and Pasting