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If the length of the diagonal of a square is increasing at the rate of 0.2 m / sec, what is therate of increase of its area when the side is230 cm?a) 3 cm2/ sec b) 6 2 cm2/ sec c) 3 2 cm2/ sec d) 6 cm2/ sec

Madhukar Anand , 10 Years ago
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Arun

Last Activity: 4 Years ago

let the side of square be X cm at any instant of time and p be it's perimeter 

 

Now :- dx/dt = 0.2cm/s 

p=4x

so 

dp/dt = 4*dx/dt

 

dp/dt= 4*0.2=0.8cm/s

Vikas TU

Last Activity: 4 Years ago

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