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20. Find the length of the diagonal of a square whose area is 128 cm Also, find its perimeter.21. The area of a square field is 8 hectares. How long would a man take to cross it digonally waking with speed of 4kmph?22. The cost of harvesting a square field at 900 per hectare is 8100. Findthe cost of putting a fence around it at rupee18per meter. please answer step by step​

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QUESTION 1.

1 PART ANSWER is 16CM and 45.24cm



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