To find the area of a rectangle, you can use the formula:
\[ \text{Area} = \text{length} \times \text{width} \]
In this case, the length is 6 cm and the width is 3 cm.
So, the calculation is:
\[ \text{Area} = 6 , \text{cm} \times 3 , \text{cm} = 18 , \text{cm}^2 \]
Therefore, the area of the rectangle is 18 cm².