// Based on the script found here: http://weeklycoder.com/2015/08/13/make-a-circle-using-linerenderer-in-unity/

public static void CreateCircle(this LineRenderer line, int segments, float radius)
{
    line.CreateCircle(segments, radius, radius);
}

public static void CreateCircle(this LineRenderer line, int segments, float xRadius, float yRadius)
{
    line.SetVertexCount(segments + 1);
    line.useWorldSpace = false;

    float x;
    float y;
    float z = 0f;

    float angle = 20f;

    for (int i = 0; i < segments + 1; i++)
    {
        x = Mathf.Sin(Mathf.Deg2Rad * angle) * xRadius;
        y = Mathf.Cos(Mathf.Deg2Rad * angle) * yRadius;

        line.SetPosition( i, new Vector3(x,y,z) );

        angle += 360f / segments;
    }
}