How many Gallons of water in a cylinder 18ft wide and 4ft high?

To calculate the number of gallons of water in a cylinder, you first need to calculate the volume of the cylinder in cubic feet. The formula for the volume of a cylinder is:

```

V = πr²h

```

Where:

* V is the volume in cubic feet

* r is the radius of the cylinder in feet

* h is the height of the cylinder in feet

In this case, the diameter of the cylinder is 18 feet, so the radius is 9 feet. The height of the cylinder is 4 feet. Plugging these values into the formula, we get:

```

V = π(9)²4

V = 324π

V ≈ 1021.02 cubic feet

```

Now, we need to convert cubic feet to gallons. There are 7.48 gallons in 1 cubic foot. So, multiplying the volume in cubic feet by 7.48 will give us the volume in gallons.

```

gallons = 1021.02 cubic feet * 7.48 gallons/cubic foot

gallons ≈ 7628.75 gallons

```

Therefore, there are approximately 7629 gallons of water in a cylinder that is 18 feet wide and 4 feet high.