Rigidbody2d rotate around a fixed point rotate

1. public void rotateRigidBodyAroundPointBy(Rigidbody rb, Vector3 origin, Vector3 axis, float angle)
   {
       Quaternion q = Quaternion.AngleAxis(angle, axis);
       rb.MovePosition(q * (rb.transform.position - origin) + origin);
       rb.MoveRotation(rb.transform.rotation * q);
   }

   Swining a rigidbody around a point - Unity Answershttps://answers.unity.com/questions/514863/swining-a-rigidbody-around-a-point.html

hold  Rigidbody rb Change it to Rigidbody2D rb That is to say

Personal test Very easy to use ！

There are several other ways ：

1. Use animation hinge

2. Create parent object rotate parent object and delete parent object