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A drain cover is made from a square meta...

A drain cover is made from a square metal plate of side 40cm having 441 holes of diameter 1cm each drilled in it. Find the area of the remaining square plate.

A

`1250.5 cm^2`

B

`1253.5 cm^2`

C

`1240.2 cm^2`

D

`1260.2 cm^2`

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