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Perimeter of square increases at the rat...

Perimeter of square increases at the rate of `0.4 cm// sec`. When the side is 20 cm, its area increases at the rate of

A

`0.4 cm ^(2)// sec.`

B

`0.8 cm^(2)//sec.`

C

`0.2 cm ^(2)//sec.`

D

`4 cm^(2)//sec.`

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