Mathematics > 2005 > 38
JAMB UTME
The radius r of a circular disc is increasing at the rate of 0.5cm/sec. At what rate is the area of the disc increasing when its radius is 6cm?
A.
36 π cm2/sec
B.
18 π cm2/sec
C.
6 π cm2/sec
D.
3 π cm2/sec
Answer: C
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