## Explanation

In geometry, a sphere is defined as the set of points that are all the same distance (r) from a given point in a three-dimensional space. The formula for calculating the volume of a sphere is:

Where r represents radius, and the greek letter π ("pi") represents the ratio of the circumference of a circle to its diameter. In Excel, π is represented in a formula with the PI function, which returns the number 3.14159265358979, accurate to 15 digits:

```
=PI() // returns 3.14159265358979
```

To cube a number in Excel, you can use the exponentiation operator (^):

```
=A1^3
```

Or, you can use the POWER function:

```
=POWER(A1,3)
```

Rewriting the formula using Excel's math operators we get:

```
=4/3*PI()*B5^3
```

Or, with the POWER function:

```
=4/3*PI()*POWER(B5,3)
```

The result is the same for both formulas. Following Excel's order of operations, exponentiation will occur before multiplication.