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A conical cavity of maximum volume is carved out from a wooden solid hemisphere of radius $10$ cm. Curved surface area of the cavity carved out is (use $\pi = 3.14$)
- (a)$314\sqrt{2}$ cm²
- (b)$314$ cm²
- (c)$\frac{3140}{3}$ cm²
- (d)$3140\sqrt{2}$ cm²
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Sol. (A) $314\sqrt{2}$ cm² (1 Mark)