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The diagonal of a square is changing at ...

The diagonal of a square is changing at the rate of `0.5cm s^-1`. Then
the rate of change of area, when the area is `400 cm^2` is equal to

A

`20 sqrt2 cm^2//s`

B

`10 sqrt2 cm^2//s`

C

`1/(10sqrt2) cm^2//s`

D

`10/sqrt2 cm^2//s`

Text Solution

Verified by Experts

The correct Answer is:
B
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