seven
60
In a 4 by 4 grid, there are 16 squares (1x1 squares), 9 rectangles that are 2x1, 6 rectangles that are 3x1, 4 rectangles that are 2x2, and 1 rectangle that is 4x4. Therefore, in total, there are 16 squares and 20 rectangles in a 4 by 4 grid.
45, including those whose sides run at an angle to the grid lines.
It is not possible to answer in terms of a grid that cannot be seen, but a normal grid of 2 squares x 2 squares will have 5 squares.
4 rectangles
90
14
9
seven
60
None they're all squares.
There are 2025 rectangles in a 9x9 grid.
That depends on how big the rectangles are.
Including squares, 1296.
Well, honey, in a 4 x 6 grid, you've got a total of 30 rectangles. You've got your 24 smaller rectangles formed by the individual squares, then you add 4 rectangles formed by 2 x 2 squares, and finally, you top it off with 2 rectangles formed by 3 x 2 squares. So, grab a calculator if you need to, but that's the tea!
45, including those whose sides run at an angle to the grid lines.