align cards on circle edge

SetCardPosition.cs

// https://discussions.unity.com/t/need-help-with-positioning-while-object-is-rotated/344542/2
private void SetCardPosition(int index)
{
    //The angle is based on how far the card is from the midpoint of the hand.
    //Note that the midpoint will either be a whole number or x.5
    float midpoint = (cards.Count-1) / 2f;
    float angle = angleDelta * (midpoint - index);

    //Positive angles rotate counterclockwise, negative angles rotate clockwise
    cards[index].transform.eulerAngles = new Vector3(0, 0, angle);

    //Mathf uses radians
    //A card that is rotated counterclockwise is on the left side of the hand,
    //while a card rotated clockwise should be on the right side of the hand.
    //This means we need to flip either the angle or the x value when calculating the
    //position.
    angle *= -Mathf.Deg2Rad;
    float x = Mathf.Sin(angle) * radius;
    float y = Mathf.Cos(angle) * radius;
    cards[index].transform.position = new Vector3(center.x + x, center.y + y, 0);
}