To find the total surface area of a cylinder, we need to calculate the surface area of the lateral side and the areas of the two circular bases (top and bottom).
The formula for the surface area \( A \) of a cylinder is given by:
\[ A = 2\pi r h + 2\pi r^2 \]
Where:
- \( r \) is the radius of the cylinder,
- \( h \) is the height of the cylinder,
- \( \pi \) is a constant (~3.14).
Given:
- Radius \( r = 4 \) feet,
- Height \( h = 3 \) feet.
First, we calculate the lateral surface area:
\[ \text{Lateral Surface Area} = 2\pi r h = 2 \times 3.14 \times 4 \times 3 \] Calculating this step-by-step:
- Calculate \( 2 \times 3.14 = 6.28 \).
- Multiply by the radius \( 4 \): \( 6.28 \times 4 = 25.12 \).
- Multiply by the height \( 3 \): \( 25.12 \times 3 = 75.36 \).
So, the lateral surface area is \( 75.36 \) square feet.
Next, we calculate the area of the two bases:
\[ \text{Area of Two Bases} = 2\pi r^2 = 2 \times 3.14 \times (4^2) \] Calculating \( 4^2 \):
\[ 4^2 = 16 \]
Calculating the area:
- Calculate \( 2 \times 3.14 = 6.28 \).
- Multiply by the area of one base \( 16 \): \( 6.28 \times 16 = 100.48 \).
So, the area of the two bases is \( 100.48 \) square feet.
Now, we add the lateral surface area and the area of the two bases:
\[ \text{Total Surface Area} = 75.36 + 100.48 = 175.84 \text{ square feet} \]
Finally, rounding to the nearest tenth:
\[ \text{Total Surface Area} \approx 175.8 \text{ square feet} \]
Thus, the surface area of the cylinder is \( \boxed{175.8} \) square feet.