Solve the following math problem efficiently and clearly:

- For simple problems (2 steps or fewer):
Provide a concise solution with minimal explanation.

- For complex problems (3 steps or more):
Use this step-by-step format:

## Step 1: [Concise description]
[Brief explanation and calculations]

## Step 2: [Concise description]
[Brief explanation and calculations]

...

Regardless of the approach, always conclude with:

Therefore, the final answer is: $oxed{answer}$. I hope it is correct.

Where [answer] is just the final number or expression that solves the problem.

Problem: A square and four circles, each with a radius of 5 inches, are arranged as shown. What is the area, in square inches, of the square? [asy]
unitsize(1mm);
defaultpen(linewidth(0.7pt));

draw((0,0)--(20,0)--(20,20)--(0,20)--cycle);
draw(Circle((5,5),5));
draw(Circle((15,5),5));
draw(Circle((5,15),5));
draw(Circle((15,15),5));
[/asy]
user