Find the surface area of tube of diameter 3.5?

To find the surface area of a tube, you need to calculate the lateral surface area and the two circular bases.

Given that the diameter of the tube is 3.5, the radius (r) is half of the diameter, so r = 3.5 / 2 = 1.75.

The lateral surface area of a tube can be calculated using the formula:

Lateral Surface Area = 2 * π * r * h

Where h is the height of the tube. Since the height of the tube is not given, we cannot calculate the lateral surface area.

The surface area of the two circular bases can be calculated using the formula for the area of a circle:

Base Area = 2 * π * r^2

Adding the lateral surface area and the two base areas gives the total surface area of the tube:

Total Surface Area = Lateral Surface Area + 2 * Base Area

Without knowing the height of the tube, we cannot calculate the total surface area.

The surface area of a tube is given by the formula:

```
Surface area = 2πrl + 2πr^2
```

where:

- r is the radius of the tube
- l is the length of the tube

In this case, the diameter of the tube is 3.5, so the radius is 1.75. We do not have the length of the tube, so we cannot calculate the surface area.