Ethan's cylinder has a larger total surface area.
Step-by-step explanation:
You total surface area of a cylinder can be calculated with the following formula:
![TSA=2\pi rh+2\pi r^2](/tpl/images/0468/3710/cca45.png)
Where "r" is the radius and "h" is the height of the cylinder,
 Then:
1) Total surface area of Tommy's cylinder
Since the radius is half the diameter:
![r_1=\frac{6.2\ in}{2}\\\\r_1=3.1\ in](/tpl/images/0468/3710/73060.png)
Knowing that:
![h_1=8.8\ in](/tpl/images/0468/3710/db344.png)
You can subsitute values into the formula and find the total surface area:
![TSA_{1}=2\pi (3.1\ in)(8.8\ in)+2\pi (3.1\ in)^2\\\\TSA_{1}=231.78\ in^2](/tpl/images/0468/3710/e8967.png)
2) Total surface area of Ethan's cylinder
Knowing that the radius is half the diameter:
![r_2=\frac{8.8\ in}{2}\\\\r_2=4.4\ in](/tpl/images/0468/3710/293a6.png)
And having:
![h_2=6.2\ in](/tpl/images/0468/3710/b66bf.png)
You can subsitute values into the formula and find the total surface area:
![TSA_{2}=2\pi (4.4\ in)(6.2\ in)+2\pi (4.4\ in)^2\\\\TSA_{2}=293.04\ in^2](/tpl/images/0468/3710/642e1.png)
Therefore, Ethan's cylinder has a larger total surface area.