The problem asks for the area of the overlapping shaded region between two squares. The given measurements indicate that one of the squares has a side length of 100 mm, and the other is rotated and overlaps with the first.

To solve this, we need to:

1. Calculate the area of the larger square.
2. Find the overlapping region's area by determining the shape formed by the intersection.
3. Use geometric properties or formulas to compute the required area.

Would you like a detailed step-by-step breakdown? Here are five related questions to extend understanding:

1. How do you calculate the area of a square given its side length?
2. What is the formula for the area of an overlapping region between two squares?
3. How does rotation affect the calculation of overlapping areas?
4. How do you determine the intersection points of two overlapping squares?
5. What methods can be used to calculate irregular overlapping regions?

Tip: When working with rotated figures, consider using coordinate geometry or trigonometry to simplify calculations.