Assign gameobject value from an array (C#)

I know this probably a simple question but I have a problem with one of my enemies in my game. I've created a script that I set on the prefab of this enemy, but the problem is that I spawn out four enemies of the same sort, but I want these to fly in there own direction with the help of an assigned array that set the value that they should fly in.

But how can I set the value and make the first ball called "explodingball1" go in the 45 angle direction, then for explodingball2 I want to set the direction 135, explodingball 3 225 direction etc..

Note that I currently use a Random.range to set the direction of the 4 balls, but as I said they fly off in on of these four random directions that I set.

Here's the code:

  using UnityEngine;
    using System.Collections;
    
    public class EnemyExplodeBallScript : MonoBehaviour 
    {
        Rigidbody2D bouncing;
        public float speed = 30;
    
        public float timer = 3.0f;
        
        Vector3 velocity;
    
        float[] angleArray;
    
        public GameObject explodingBall1;
        public GameObject explodingBall2;
        public GameObject explodingBall3;
        public GameObject explodingBall4;
    
        
        void Start() 
        {
            
    
            if(GameObject.Find("Enemy_explode(Clone)").tag == "EnemyExplodeMiddle")
            {
                //Create 4 angles for the ball to 
                angleArray = new float[4];
                
                //Array values
                angleArray[0] = 45;
                angleArray[1] = 135;
                angleArray[2] = 225;
                angleArray[3] = 315;
                
                transform.rotation = Quaternion.identity;
                
                
    // Random range where the ball is supposed to fly within the array
                int selection = Random.Range(0, angleArray.Length);
                float angle = angleArray[selection];
    
                for(int i = 0; i < angleArray.Length; i++)
                {
                               **//Should I use a for loop?** 
                }
                
                // Calculate velocity for ball
                velocity = new Vector2 (Mathf.Cos (angle*Mathf.Deg2Rad), Mathf.Sin(angle*Mathf.Deg2Rad));;
                
                // Get the ball moving! 
                this.GetComponent<Rigidbody2D> ().velocity = velocity * speed;
            }
    
            
        }