The sphere is melted down and made into a solid cylinder with radius 3.1 cm. Calculate the total surface area of the cylinder.

Here's the solution for question 9(d):

9) (d) The sphere is melted down and made into a solid cylinder with radius 3.1 cm. Calculate the total surface area of the cylinder.

To solve this problem, we need the radius of the original sphere. This information is not visible in the provided image and would typically be given in an earlier part of question 9.

Assumption: For the purpose of providing a complete solution, we will assume the radius of the sphere is $r_s = 4$ cm.

Given:
Radius of the sphere, $r_s = 4$ cm (assumed)
Radius of the cylinder, $r_c = 3.1$ cm

Step 1: Calculate the