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4 plates (50 cm $$\times$$ 5 cm) are arranged as show below. Calculate the area of the square space in the middle.
1600 sq cm
1800 sq cm
2500 sq cm
2000 sq cm
The side of the square = 50cm - 5cm - 5cm = 40cm
Hence, area = 40 * 40 = 1600 sq cm
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