None they're all squares.
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There are 2025 rectangles in a 9x9 grid.
That depends on how big the rectangles are.
441
14
Oh, dude, let me count... Okay, so in a 5 by 6 grid, you've got like 15 horizontal rectangles and 10 vertical rectangles, but don't forget the big one that covers the whole grid, so that's like 26 rectangles total. So, like, yeah, there you go.