Discussion

Explanation:

Total outer surface area of a sphere of radius r = 4πr2

When the sphere is cut into 4 identical pieces, each piece will expose πr2/2 + πr2/2 = πr2 area more.

∴ Now, 4πr2 additional area needs to be painted which will require 2 more liters of paint.

∴ 4 litres of paint will be needed.

Hence, option (d).

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