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4 (i) The perimeter of a square in 20 cm. Find its area.(i) The perimeter of a square field in 8 km. Find its area in hectares.t un into small squares o |
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Answer» i) Perimeter of a square= 4a 20=4aa=5 cmArea = a^2=5×5 =25 cm^2 ii) Perimeter=4a8 km =4aa=2 k mArea=a^2=4 km^2.1 km^2 =100 hectaresSo 4 km^2 =400 hectares. So it's area is 400 hectares i) p of sq. = 4×side20=4×side20÷4=side5cm=side Area =side×side =5×5 =25cm^2 ii)p=4×side 8km= 4×side 8km÷4 = side 2km = side area = side × side area = 2×2 area = 4km^2 1km^2=100 hectares therefore, 4km^2 = 400hectares since, area = 400hectares |
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