20. The diagonal of a square is 5 /2 m. Find its area and perimeter. 21. The diagonal of a square is 12 cm long. Find its area and perimeter. 22. The area of a square field is 32 m². Find its diagonal. 23. The area of a square is 81 cm². Find its perimeter and the length of its diagonalp. ost of putting a fence round it at 32.5 .
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