The provided diagram appears to be a rectangle with labeled dimensions: $7$ units for its length and $3$ units for its width. The task is to calculate the area of the rectangle.

Formula for the Area of a Rectangle:

$\text{Area} = \text{Length} \times \text{Width}$

Substituting the given values:

$\text{Area} = 7 \times 3 = 21 \, \text{square units}.$

Final Answer:

$\text{Area} = 21 \, \text{square units}.$

Would you like more details or clarification?
Here are 5 related questions to deepen understanding:

1. How do you calculate the perimeter of this rectangle?
2. What would the area be if the dimensions were doubled?
3. If the width was increased by 2 units, what would the new area be?
4. What is the formula for the diagonal length of a rectangle?
5. How does the area of a rectangle compare to other quadrilaterals?

Tip: Always include the units in your final answer to ensure clarity in your calculations!