[size=150][font=Trebuchet MS][b]At first, we tried to find the parametric equations with the similar way of previous one.[br]However, it wasn't easy to figure out. Therefore, I tried with a[color=#ff7700] method using vectors[/color].[br]Since this curve is continuous curve, we set a tiny angle moved state and find the coordinate of each vector, add them all.[/b][/font][/size]