How to adjust the Form according to the size of the Picturebox?

Question

How do I resize my form according to the size of the Picturebox component?

In this case, the images in the Boxes may have different sizes. So I would like my Form to fit the size of the Picturebox. For example, if the image increases in size, the Form should follow its size.

Here I change the size of the Picturebox, but the Form does not resize.

public ResolverCaptcha(Bitmap imagemCaptcha, string mensagem)
    {
        InitializeComponent();
        lblMensagem.Text = mensagem;
        pctCaptcha.Width = imagemCaptcha.Width;
        pctCaptcha.Height = imagemCaptcha.Height;
        pctCaptcha.Image = imagemCaptcha;
    }

This is the Form:

Answer 1

It is necessary to change the size of the form "at hand". It will not resize itself.

Size = new Size(novaLargura, novaAltura);