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The gas tank in the image is shaped like a cylinder with two hemispherical ends. We need to calculate its total surface area, which includes both the surface area of the cylindrical part and the surface area of the two hemispheres.

### Given:
- The total length of the gas tank (including hemispheres) is 79 cm.
- The diameter of the hemispheres and the cylinder is 45 cm, which gives the radius \( r = \frac{45}{2} = 22.5 \) cm.
- The cylindrical part's length is the total length minus the lengths of the hemispheres (since two hemispheres make one sphere):  
  \( \text{Cylindrical length} = 79 - 45 = 34 \) cm.

### Formulae:
1. **Surface area of a sphere** (since two hemispheres make one sphere):  
   \[
   A_{\text{sphere}} = 4\pi r^2
   \]
2. **Surface area of a cylinder** (not including the circular ends):  
   \[
   A_{\text{cylinder}} = 2\pi r h
   \]
   where \( h \) is the cylindrical height (34 cm in this case).

### Step-by-Step Calculation:
1. **Surface area of the hemispheres** (which make one full sphere):
   \[
   A_{\text{hemispheres}} = 4\pi (22.5)^2
   \]
2. **Surface area of the cylindrical part**:
   \[
   A_{\text{cylinder}} = 2\pi (22.5)(34)
   \]

Let me compute these values now.The total surface area of the gas tank is approximately **11,168.4 cm²**, rounded to 1 decimal place.

Would you like any further details or clarifications on the calculation?

Here are 5 related questions to explore:
1. How would the surface area change if the radius were doubled?
2. What is the formula for the volume of such a gas tank?
3. How would you calculate the surface area of only the cylindrical part?
4. What happens to the surface area if we remove the hemispherical ends?
5. How does the surface area compare to that of a fully spherical gas tank of the same radius?

**Tip:** Always ensure units are consistent throughout your calculations, particularly when working with mixed measurements.

Calculate the surface area of the gas tank shaped like a cylinder with hemispherical ends, given the total length is 79 cm and the diameter is 45 cm. Provide the answer to 1 decimal place.

Calculate the surface area of a gas tank shaped like a cylinder with two hemispherical ends, using geometry formulas. Given a total length of 79 cm and a diameter of 45 cm, this problem helps you learn how to apply surface area formulas for composite shapes. Suitable for students in Grades 10-12.

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