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A circular disc of radius 3 cm. is heated. Due to expansion its radius increases at the rate of …
A circular disc of radius 3 cm. is heated. Due to expansion its radius increases at the rate of $0.05\text{ cm/s}$. Find the rate at which its area increases when the radius is $3.2\text{ cm}$.
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From ISC 2018 Specimen Mathematics Paper 1, question 8(b).