from a square cardboard of side 21 cm a circle of maximum area is cut out .find the area of the cardboard left
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Side of square =Area
=196=14
Diameter of circle with largest possible are a cut out from square = side of square
d=14r=2d=7cm
Area of circle πr2=722×7×7
=154cm2
Area of Remaining board = Area of square - Area of circle
=196−154=42cm2
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