Check out example codes for "instantiate object in circle". It will help you in understanding the concepts better.

Code Example 1

float radius = 1f;
 int amountToSpawn;
 for (int i = 0; i < amountToSpawn; i++)
 {
     float angle = i * Mathf.PI*2f / amountToSpawn;
     Vector3 newPos = new Vector3(Mathf.Cos(angle)*radius, y, Mathf.Sin(angle)*radius);
     GameObject go = Instantiate(GameObject.CreatePrimitive(PrimitiveType.Cube), newPos, Quaternion.identity);
 }

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