To find the length of the rectangle with an area of 16 cm² and a width of 4 cm, you can use the formula for the area of a rectangle:
\[ \text{Area} = \text{Length} \times \text{Width} \]
Given that the area is 16 cm² and the width is 4 cm, you can substitute these values into the formula:
\[ 16 = \text{Length} \times 4 \]
Now, to find the length, divide both sides by 4:
\[ \text{Length} = \frac{16}{4} = 4 \text{ cm} \]
Thus, the length of the rectangle is 4 cm.
Here's the completed table including this new rectangle:
| Area of a rectangle (cm²) | Length of a rectangle (cm) | |----------------------------|-----------------------------| | 16 | 8 | | 16 | 4 |