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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