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rectangle
A quadrilateral whose interior angles are all 90°. If all of its sides are the same length, it is a square. The rectangle is a special case of a parallelogram
The smallest square that can be cut into m × n rectangles, such that all m and n are different integers, is the 11 × 11 square, and the tiling uses five rectangles. The smallest rectangle that can be cut into m × n rectangles, such that all m and n are different integers, is the 9 × 13 rectangle, and this tiling also uses five rectangles.
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