1. **Problem Statement:** We have two rectangles placed such that the diagonal starts from the right top corner of the first rectangle and ends at the left bottom corner of the second rectangle. 2. **Understanding the Setup:** Let's denote the first rectangle as Rectangle 1 and the second as Rectangle 2. 3. **Key Points:** The diagonal line connects the right top corner of Rectangle 1 to the left bottom corner of Rectangle 2. 4. **Formula and Approach:** To analyze or find the length of this diagonal or any related property, we use the distance formula between two points in the coordinate plane: $$d = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}$$ where $(x_1, y_1)$ and $(x_2, y_2)$ are the coordinates of the two points. 5. **Assign Coordinates:** Suppose Rectangle 1's right top corner is at $(x_1, y_1)$ and Rectangle 2's left bottom corner is at $(x_2, y_2)$. 6. **Calculate Diagonal Length:** Substitute these coordinates into the distance formula to find the diagonal length. 7. **Explanation:** This formula calculates the straight-line distance between two points, which is exactly the diagonal connecting the specified corners. This is the general method to analyze the diagonal connecting the two rectangles as described.