The rate of change of the area of a circle with respect to its radius when the radius is 5 cm is:
The rate of change of the area of a circle with respect to its radius when the radius is 5 cm is:
- A. 10π cm²/cm
- B. 5π cm²/cm
- C. 25π cm²/cm
- D. 2π cm²/cm
Answer: A) 10π cm²/cm
Explanation: Area A = πr². dA/dr = 2πr. At r = 5, dA/dr = 10π cm²/cm.
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