The radius r of a circular disc is increasing at the rate of 0.5cm/sec. At...
MATHEMATICS
JAMB 2005
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
Correct Answer: C. 6 π cm2/sec
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