Degrees To XY Coordinates

private PointF DegreesToXY(float degrees, float radius, Point origin)
{
    PointF xy = new PointF();
    double radians = degrees * Math.PI / 180.0;

    xy.X = (float)Math.Cos(radians) * radius + origin.X;
    xy.Y = (float)Math.Sin(-radians) * radius + origin.Y;

    return xy;
}

private float XYToDegrees(Point xy, Point origin)
{
    int deltaX = origin.X - xy.X;
    int deltaY = origin.Y - xy.Y;

    double radAngle = Math.Atan2(deltaY, deltaX);
    double degreeAngle = radAngle * 180.0 / Math.PI;

    return (float)(180.0 - degreeAngle);
}