Let's calculate the square footage of the wall by breaking it into several components and subtracting the area of the door.

1. Dimensions of the wall:

• Total height: 9 feet
• Total width: 4 feet 2 inches = $4 \frac{2}{12}$ feet = 4.167 feet

2. Skirting:

• The height of the skirting is 4 inches, which is $\frac{4}{12} = 0.333$ feet.
• This reduces the effective height of the wall to $9 - 0.333 = 8.667$ feet or 8 feet 8 inches.

3. Door dimensions:

• Height of the door: 6 feet 11 inches = $6 \frac{11}{12} = 6.917$ feet
• Width of the door: 3 feet 2 inches = $3 \frac{2}{12} = 3.167$ feet

4. Side wall thickness:

• Left side wall: 2 1/4 inches = $\frac{2.25}{12} = 0.1875$ feet
• Right side wall: 9 3/4 inches = $\frac{9.75}{12} = 0.8125$ feet

Calculation of the Wall Area:

Total wall area:

$\text{Total Wall Area} = \text{Width} \times \text{Height} = 4.167 \, \text{ft} \times 8.667 \, \text{ft} = 36.12 \, \text{sq ft}$

Door area:

$\text{Door Area} = \text{Width} \times \text{Height} = 3.167 \, \text{ft} \times 6.917 \, \text{ft} = 21.91 \, \text{sq ft}$

Net Wall Area (subtracting door):

$\text{Net Wall Area} = \text{Total Wall Area} - \text{Door Area} = 36.12 \, \text{sq ft} - 21.91 \, \text{sq ft} = 14.21 \, \text{sq ft}$

Thus, the area of the wall is 14.21 square feet.

Would you like more details or any clarifications?

Here are 5 related questions:

1. How would adding windows affect the total wall area?
2. What would be the cost of painting the wall if the rate is $2 per square foot?
3. How does the skirting size impact the overall wall height?
4. How would we calculate the area if the wall was a triangle or irregular shape?
5. What is the perimeter of the door in feet?

Tip: When dealing with mixed units (feet and inches), always convert them to a consistent unit (e.g., feet) for easier calculations.