The image appears to be a grid-like structure, and we need to calculate the number of rectangles formed by the grid.

To calculate the number of rectangles in a grid:

1. Identify how many horizontal and vertical lines there are. These lines form the edges of the rectangles.
2. If there are $m$ horizontal lines and $n$ vertical lines, the number of rectangles formed is the combination of selecting two horizontal lines and two vertical lines.

Let's first identify the number of horizontal and vertical lines in the grid based on the provided image.The total number of rectangles in the grid is 210.

Do you have any further questions or would you like more details?

Here are some related questions:

1. How would the formula change if the grid had diagonal lines?
2. Can we apply this method to 3D shapes like cubes?
3. What is the number of squares in this grid?
4. How do combinations work in calculating geometric figures like rectangles?
5. How can we generalize this method to non-uniform grids?

Tip: Remember, the combination formula $C(n, k)$ helps count the ways to choose $k$ lines from $n$, forming the boundaries of shapes like rectangles or squares.