Is it possible to add Angle to Raycast2D?

Here You have a full script:

 using UnityEngine;
 using System.Collections;
 
 public class RotateRaycast_Script : MonoBehaviour
 {
     public Vector2 pivotPoint = Vector2.zero;
     public float range = 5.0f;
     public float angle = 45.0f; 
 
     private Vector2 startPoint = Vector2.zero; 
 
     // Use this for initialization
     void Start ()
     {
         
     }
     
     // Update is called once per frame
     void Update ()
     {
         startPoint = (Vector2)transform.position + pivotPoint; // Update starting ray point.
 
         // Direct use.
         // Get normalized (of length = 1) distance vector.
         // Vector2 direction = new Vector2(Mathf.Cos(angle * Mathf.Deg2Rad), Mathf.Sin(angle * Mathf.Deg2Rad)).normalized; 
 
         // Using function.
         Vector2 direction = GetDirectionVector2D(angle);
 
         Physics2D.Raycast(startPoint, direction, range); // Shot ray.
 
         // Draw ray. For Debug we have to multiply our direction vector. 
         // Even if there is said Debug.DrawRay(start, dir), not Debug.DrawRay(start, end). Keep that in mind.
         Debug.DrawRay(startPoint, direction * range, Color.red); 
       
     }
 
     public Vector2 GetDirectionVector2D(float angle)
     {
         return new Vector2(Mathf.Cos(angle * Mathf.Deg2Rad), Mathf.Sin(angle * Mathf.Deg2Rad)).normalized;
     }
 }
 

Cheers!