Question 70

The radius of a sphere and hemisphere are same. The ratio of their total surface area is

Solution

Let the radius of sphere and hemisphere be $$r$$ cm

Thus, ratio of their total surface area is

= $$\frac{4\pi r^2}{3\pi r^2}$$

= $$\frac{4}{3}$$

$$\therefore$$ The ratio of their total surface area = 4 : 3

=> Ans - (D)

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