A circle's radius is increasing at
0.1
\displaystyle {0.1}
0.1
feet/minute. How rapidly is its area increasing when the radius is
3
\displaystyle {3}
3
feet?
The circle's area is increasing at
feet
2
minute
\displaystyle \frac{\text{feet}^{{2}}}{\text{minute}}
minute
feet
2
.
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Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
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