JAMB Mathematics 2013 Objective — Question 37
Question 37 of 50 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2013 Objective paper, with the correct answer and a full explanation.
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The radius of a circle is increasing at the rate of 0.02 cms⁻¹. Find the rate at which area is increasing when radius is 7cm.
- A. A. 0.35 cm²s⁻¹
- B. B. 0.88 cm²s⁻¹Correct
- C. C. 0.75 cm²s⁻¹
- D. D. 0.53 cm²s⁻¹
Explanation
dA/dt=2πr×dr/dt=2π×7×0.02=0.88 cm²s⁻¹.
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