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प्रश्न
What is the rate of change of the area of a circle with respect to its radius when, r = 3 cm
विकल्प
`r`
`pir`
`2 pir`
Zero
MCQ
उत्तर
`2 pir`
Explanation:
Let 'A' be the area of the circle of radius 'r', then
= `pir^2` and `(dA)/(dr) = 2pir`
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