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81
9
None they're all squares.
9 (six rectangles = three 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.
-9
To determine how many rectangles of different sizes can be formed from 36 identical squares, we first need to find the possible dimensions of rectangles that can be created using these squares. The total area of the rectangles must equal 36, which can be expressed as ( length \times width = 36 ). The pairs of factors of 36 are (1, 36), (2, 18), (3, 12), (4, 9), and (6, 6), leading to 10 unique rectangles when considering both orientations (length × width and width × length). Thus, a total of 10 different rectangles can be formed.
9 obvious, 3 for each row, 3 for each column, 4 for each rectangle of 4 squares, all of the squares. So 19
There are 81 squares in a 9 by 9 square.
9 x 9 = 81 squares.
81 Squares -- Deo Math Club
Multiple them! 3x3=9 squares!