From a rectangular cardboard sheet 145 cm long and 32 cm broad ,42 circular plates each of diameter 8 cm cut out. Find the area of the remaining portion of the sheet.
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Step-by-step explanation:
area of rectangular sheet = 145×32 = 4640 cm²
radius of 1plate = 8÷2=4
area of 1 plate =πr² = 4×4π = 16 π cm ²
area of 42 plates = 42× 16π
= 2112cm²
area of remaining portion of sheet = 4640 - 2112 = 2528cm²
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