## 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 surface area of a sphere is:

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

```
=A1^2
```

Or, you can use the POWER function:

```
=POWER(A1,2)
```

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

```
=4*PI()*B5^2
```

Or, with the POWER function:

```
=4*PI()*POWER(B5,2)
```

For example, with a radius of 5 hardcoded into the formulas we have:

```
=4*PI()*5^2 // returns 314.16
=4*PI()*POWER(5,2) // returns 314.16
```

and both formulas return the same result. Following Excel's order of operations, exponentiation will occur before multiplication.