To get the value of the Pi (π) constant in Go, use the mathematical constant `math.Pi`

from the standard library `math`

package.

```
package main
import (
"fmt"
"math"
)
func main() {
fmt.Printf("%.48f", math.Pi)
}
```

Output:

```
3.141592653589793115997963468544185161590576171875
```