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Area of square sheet = (side)²
= (30)²
= 900cm²
radius of circle = 3.5cm
area of 1 circle = πr²
= 22\7*(3.5)²
=38.5cm²
area of 20 circles = 38.5*20
= 770.0cm²
therefore,area of remaining sheet = 900-770 =130cm²
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