From four corners of a square sheet of side 4 cm, four pieces, each in the shape of arc of a circle with radius 2 cm, are cut out. The area of the remaining portion is :
Answer : Option B
Explanation : 
Area of sectors = Sr2
= 4π sq.cm.
Area of square
= 4 × 4 = 16 sq.cm.
Area of the remaining portion
= (16 – 4π) sq.cm.
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