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The total perimeter of the Square Paper is actually half of the total perimeter of the 4 rectangles.         (by just counting from the picture. 2 sides of each rectangle form the square)

Therefore,

180 / 2 = 90cm

90 / 4 = 22.5cm 

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Aligning the lower in-between vertical line with that of the upper in-between vertical, there would be 8 similar lengths and 8 similar breadths.
180/8 = 22.5

Ans : 22.5 cm.

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