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UNO [17]
3 years ago
10

Suppose a forest fire spreads in a circle with radius changing at a rate of 5 feet per minute. At what rate is the area of the b

urning region increasing when radius reaches 200 feet?
Mathematics
1 answer:
Stolb23 [73]3 years ago
8 0
A = πr²
<span>dR/dt = 5 (given)
dA/dr = dA/dr * dr/dt = 2 pi r * 5
 
dA/dr is therefore 10</span>πr when radius is 200 ft, dA/dr is 2000 pi ft/min

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