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Find the rate of change of the area of a circle with respect to its radius r when (a) r = 3 cm (b) r = 4 cm |
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Answer» (a) A = πr2 \(\frac{dA}{dr}\) = π x 2r = 2π x 3 = 6π cm (b) A = πr2 \(\frac{dA}{dr}\) = 2πr = 2π x 4 = 8πcm |
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