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Question 104
The radius (in units) of the sphere whose surface area and volume are numerically equalis
Solution
Surface area of the sphere= $$4\pi\ r^2$$
Volume of the sphere= $$\frac{4}{3}\pi\ r^3$$
Hence $$\frac{4}{3}\pi\ r^3=4\pi\ r^2\ or\ r=3$$
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