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Question 4
The volume of a sphere equals its surface area only when its radius (in units) equals :
Solution
Let the radius of the circle = r
Given, volume of the sphere is equal to its surface area
$$\Rightarrow$$ $$\frac{4}{3}\pi r^3=4\pi r^2$$
$$\Rightarrow$$ r = 3 units
Hence, the correct answer is Option D
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