Oh, dude, you're really making me count squares now? Alright, so in a 12 by 12 grid, you've got 144 squares in total. Yeah, that's like, if you count 'em all up, you'll find a grand total of 144 squares. Happy now?
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In a 12 by 12 grid, you can calculate the total number of squares by adding up the squares of each individual size. There will be 1 square of size 12x12, 4 squares of size 11x11, 9 squares of size 10x10, and so on, until you reach 144 squares of size 1x1. Adding all these up, the total number of squares in a 12 by 12 grid is 650.
You could count them, or you could look at it, notice that there are 3 rows of 4 squares, and recall that (3 x 4 = 12).
12 squares in total.
There are 9 squares I can see 12 squares in an array of 2 * 4 squares
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.
12