Check if a gameobject surrounded by colliders

I need to know if my gameobject is surrounded by 2D edgeColliders in order to know if its trapped or not. I tried to send raycast around gameobject 360 degree but i couldn't solve the issue!

Here is the code for raycasting

                     isTrapped = true;
                     for(int i =0;i<=360;i++)
                     {

                         Vector3 direction = new Vector3(Mathf.Cos(i*0.0174f),Mathf.Sin(i*0.0174f),0);
                         RaycastHit2D hit  = Physics2D.Raycast(raycastObject.transform.position,direction,35f,layermask);
                         Debug.DrawRay(raycastObject.transform.position,direction,Color.green);

                         if(hit.collider==null && hit.collider==null)
                             isTrapped=false;


                     }

                     if(isTrapped)
                         Debug.Log("isTrapped = true");

Basically what i wanted to check is below image. X,Y,Z are dynamically changing so i cannot use sphere cast

and