1. **Stating the problem:** We have a parallelogram with the top side length 27 cm and the right side length 18 cm. The left side is labeled $c$ and the bottom side is labeled $d$. We need to find the values of $c$ and $d$. 2. **Formula and properties:** In a parallelogram, opposite sides are equal in length. This means: $$c = \text{length of the side opposite to } c$$ $$d = \text{length of the side opposite to } d$$ 3. **Applying the property:** - The side $c$ is opposite to the side with length 27 cm. - The side $d$ is opposite to the side with length 18 cm. 4. **Conclusion:** $$c = 27 \text{ cm}$$ $$d = 18 \text{ cm}$$ Because opposite sides of a parallelogram are equal in length.