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Each side of an equilateral triangle inc...

Each side of an equilateral triangle increases ta a uniform rate of `0.5 cm // sec`. When each side is 40 cm , its area is increasing at the rate of

A

`5sqrt3 cm^(2) // sec`.

B

`10sqrt3 cm^(2) //sec`

C

`20 sqrt3 cm^(2)//sec`.

D

`15sqrt3 cm^(2) //sec`

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The correct Answer is:
B
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