How to i add force in a angle i have got?

I have an angle and I want to add force in that direction. It is a 2d game here is the code for the script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;

 public class PlayerController : MonoBehaviour
 {
     public float movementSpeed = 3.0f;
     float movement = new float();
     public float shootdirection;
     public float recoildirection;
     public Vector2 flydirection;
     Rigidbody2D rb2D;
 
     private void Start()
     {
         rb2D = GetComponent<Rigidbody2D>();
     }
 
     private void Update()
     {
         
     }
 
     private void FixedUpdate()
     {
         setvalues();
     }
 
     void setvalues()
     {
         shootdirection = GameObject.Find("Arrow").GetComponent<PointerController>().z_rotation;
         recoildirection = GameObject.Find("Arrow").GetComponent<PointerController>().thrustdirection;
     }
 
     void blast()
     {
         
     }
 }