I took the code below from this question: Instantiate prefabs in a circle or elipsoid - Unity Answers

```
var numPoints = 20;
var centrePos = Vector3(0,0,32);
for (var pointNum = 0; pointNum < numPoints; pointNum++)
{
// "i" now represents the progress around the circle from 0-1
// we multiply by 1.0 to ensure we get a fraction as a result.
var i = (pointNum * 1.0) / numPoints;
// get the angle for this step (in radians, not degrees)
var angle = i * Mathf.PI * 2;
// the X & Y position for this angle are calculated using Sin & Cos
var x = Mathf.Sin(angle) * radiusX;
var y = Mathf.Cos(angle) * radiusY;
var pos = Vector3(x, y, 0) + centrePos;
// no need to assign the instance to a variable unless you're using it afterwards:
Instantiate (beadPrefab, pos, Quaternion.identity);
}
```

However, I don’t understand what radiusX and radiusY represent. If someone could clear it up for me I would appreciate it.