# Pi in R: Built-in Constants

Pi is a built-in R constant whose value is 3.141593. Pi is the ratio of the circumference of a circle to its diameter.

## Syntax

``pi``

## Example 1: Basic usage

``print(pi)``

Output

``[1] 3.141593``

## Example 2: Exponential value of pi

To calculate the exponential value of pi, use the exp() function.

``exp(pi)``

Output

``[1] 23.14069``

## Example 3: Cos value of pi

To calculate the cosine value of pi, use the cos() function.

``cos(pi)``

Output

``[1] -1``

## Example 4: Sine value of pi

To find the sine value of pi, use the sin() function.

``sin(pi)``

Output

``[1] 1.224647e-16``

## Example 5: Tangent of pi

To calculate the tangent of pi, use the tan() function and pass the pi.

``tan(pi)``

Output

``[1] -1.224647e-16``

## Example 6: Arccos value of pi

To calculate the arccos value of pi, use the acos() and pass the pi.

``acos(pi)``

Output

``````[1] NaN
Warning message:
In acos(pi) : NaNs produced``````

It returns the NaN value.

## Example 7: Arcsin value of pi

To calculate the arccos value, use the asin() function.

``asin(pi)``

Output

``````[1] NaN
Warning message:
In asin(pi) : NaNs produced``````

It returns NaN too.

## Example 8: Arctan value of pi

To calculate the arccos value, use the atan() function.

``atan(pi)``

Output

``[1] 1.262627``

That’s it!