Answer:
Step-by-step explanation:
Since, we know that,
The surface area of a cylinder having both ends in both sides,
Where,
r = radius,
h = height,
Given,
Diameter of the sphere = 4 cm,
So, by using Pythagoras theorem,
( see in the below diagram ),
Thus, the surface area of the cylinder,
Differentiating with respect to r,
Again differentiating with respect to r,
For maximum or minimum,
Since, for r = √2,
Hence, the surface area is maximum if r = √2,
And, maximum surface area,
