To calculate the square footage of a room, you multiply the length by the width.

Given the room dimensions:

• Length: 13 feet
• Width: 18 feet

So, the square footage is:

$13 \, \text{ft} \times 18 \, \text{ft} = 234 \, \text{square feet}$

Therefore, the room is 234 square feet.

Would you like more details or further explanations?

Here are some related questions:

1. How do you calculate the area of a room with irregular shapes?
2. What is the difference between square feet and cubic feet?
3. How do you convert square footage to square meters?
4. How do you determine the amount of paint needed for a room based on square footage?
5. What is the formula for calculating the area of a triangle or other polygon?

Tip: Always make sure to measure in consistent units (feet, meters, etc.) to avoid errors when calculating area.