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प्रश्न
The rate of change of area of a circle with respect to its radius r at r = 6 cm is ____________.
पर्याय
`12pi`
`11pi`
`8pi`
`10pi`
MCQ
रिकाम्या जागा भरा
उत्तर
The rate of change of the area of a circle with respect to its radius r at r = 6 cm is `underline(12pi)`.
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