We can maximum of 4 rectangles (square which is also a rectangle) by using 12 toothpicks.
A rectangle is a geometrical 2d figure in which the opposite sides should be the same and parallel.
The angle between any two adjacent sides must be 90°.
A square is also a rectangle because it is satisfying the definition of the rectangle.
Four rectangles using 12 toothpicks as shown below,
For more about rectangles,
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