Q a biscuit laid into a rectangular tray of length 2.5m and breadth 1m out of this 1000 biscuits of radii 2.8cm each are cut out from a circular disc .how much area of ring is left wasted .

Area of rectangle = 250 ×100 = 25,00,00 cm2Area of 1000 circular biscuits =1000 πr2=227×(2.8)2×1000 = 24,640 cm2Area left = 250,000 - 24,640 = 360 cm2

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Area wasted = (250*100 ) - 1000( 22/7*2.8*2.8) = 360cm2

Hope you understand

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