1. **State the problem:** We are given a prism with a cross-sectional area of 18 cm² and a length of 3 cm. We need to find the volume of the prism. 2. **Formula used:** The volume $V$ of a prism is calculated by multiplying the cross-sectional area $A$ by the length $L$ of the prism: $$V = A \times L$$ 3. **Given values:** - Cross-sectional area $A = 18$ cm² - Length $L = 3$ cm 4. **Calculate the volume:** $$V = 18 \times 3 = 54$$ 5. **Interpretation:** The volume of the prism is 54 cubic centimeters (cm³). This means the prism occupies a space of 54 cm³ based on its cross-sectional area and length.