Quaternion.Angle

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public static method Angle(a: Quaternion, b: Quaternion): float;

public static float Angle(Quaternion a, Quaternion b);

Description

Returns the angle in degrees between two rotations a and b.

// Calculates the angle (degrees) between
// the rotation of this transform and target.

var target : Transform;

function Update () {
    var angle : float = Quaternion.Angle(transform.rotation, target.rotation);
}

using UnityEngine;
using System.Collections;

// Calculates the angle (degrees) between
// the rotation of this transform and target.

public class ExampleClass : MonoBehaviour
{
    public Transform target;

    void Update()
    {
        float angle = Quaternion.Angle(transform.rotation, target.rotation);
    }
}