Asked by Sandra Gibson
Suppose a forest fire spread in a circle with radius changing at a rate of 5 feet per minute. When the radius reaches 200 feet, at what rate is the area of the burning region increasing?
Answers
Answered by
bobpursley
area= PI r^2
dArea/dt= PI *2r* dr/dt
r=200, dr/dt=5, compute dArea/dt
dArea/dt= PI *2r* dr/dt
r=200, dr/dt=5, compute dArea/dt
Answered by
favour
2000pi cm2per minute
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