Version: 2019.1
public static float PI ;


The well-known 3.14159265358979... value (Read Only).

The ratio of the circumference of a circle to its diameter. Note that this value is a 32-bit floating point number i.e. a float. Approximately seven digits of precision are provided.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour { public float radius = 5;

void Start() { float perimeter = 2.0f * Mathf.PI * radius; Debug.Log("The perimeter of the circle is: " + perimeter); } }