Math, asked by reshmidey222, 1 year ago

solve this one frdzz the first one with full solution -1 (i)

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Answered by Anonymous

1

dr/dt=4cm/s

dA/dt=d(πr^2)/dt=2πrdr/dt=2πr(4)=8πr

dA/dt(r=5)=8π(5)=40π

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