// Prints 90
Debug.Log(Mathf.DeltaAngle(1080,90));

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void Example() {
        Debug.Log(Mathf.DeltaAngle(1080, 90));
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def Example():
        Debug.Log(Mathf.DeltaAngle(1080, 90))