Question

Q. The radius of a circle is increasing at the
rate of (t) ms' . At what rate is the circle's
area increasing
when r= 10 m ?​

Answer 1

Answer:

Given dr/dt = 0.1 cm/sec , r= 5 cm

Area of circle = πr²

DA/dt = d(πr²)/dt

= 2πrdr

Putting value of dr and r

dA/ dt = 2*3.14*5*0.1 cm²/ sec

= 3.14 cm²/ sec

Step-by-step explanation:

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