A stone is dropped into a quiet lake and...

A stone is dropped into a quiet lake and waves in circles at the speed of 5 cm/s. At the instant when the radius of the circular wave is 8 cm, how fast is the enclosed area increasing?

A

`8x " cm^(2)//s`

B

`80pi " cm^(2)//s`

C

`6pi " cm^(2)//s`

D

`(8)/(3) " cm^(2)//s`

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The correct Answer is:

B

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