To solve the problem of finding the number of rectangles in a grid, we use the following approach:
A rectangle is formed by choosing 2 distinct horizontal lines and 2 distinct vertical lines from the grid. For a grid with (a) rows and (b) columns of squares:
The number of rectangles is the product of combinations of choosing 2 lines from each set:
[ \text{Number of rectangles} = \binom{a+1}{2} \times \binom{b+1}{2} = \left(\frac{a(a+1)}{2}\right) \times \left(\frac{b(b+1)}{2}\right) ]
Given common problem contexts (since the image is unavailable), we assume the grid is 4 rows and 5 columns of squares (a frequent problem setup).
Calculation:
[ \left(\frac{4×5}{2}\right) × \left(\frac{5×6}{2}\right) = (10) × (15) = 150 ]
Answer: (\boxed{150})
(Note: If the grid size differs, adjust using the formula above. This answer is based on a common problem scenario.)
(\boxed{150})
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