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RAJU BANERJEE
Answers (2)
πr^2=2×28/11=56/11,r=14/11 Now a=πr^2 And derivative w.r.t t,we get da/dt=2πr dr/dt 2=2π×14/11×dr/dt dr/dt=11/14π=1/4=.25
πr^2=2×28/11 r=14/11 let,a=πr^2 da/dt=2πr dr/dt 2 =2π×14/11×dr/dt dr/dt=11/14π =1/4 =.25
