4 rectangles
90
9
24 sqares in a gris 4x6
4 squares in a 2 by 2 grid 9 squares in a 3 by 3 grid 16 squares in a 4 by 4 grid 25 squares in a 5 by 5 grid 36 squares in a 6 by 6 grid 49 squares in a 7by 7 grid 64 squares in a 8 by 8 grid 81 squares in a 9 by 9 grid 100 squares in a 10 by 10 grid
Rectangles and squares both have 4 corners.
96 rectangles.
90
14
9
seven
60
None they're all squares.
24 sqares in a gris 4x6
There are 2025 rectangles in a 9x9 grid.
That depends on how big the rectangles are.
Including squares, 1296.
45, including those whose sides run at an angle to the grid lines.