我怎样才能使角度 theta 更大，以便它覆盖更多的空间？

Question

这是我目前拥有的：它不适合这个空间，所以我该怎么做才能使它更大/更适合？

下面是代码：

\documentclass[letterpaper]{article}
\usetikzlibrary{arrows,calc,positioning,patterns,angles,quotes}
\begin{tikzpicture}[>=latex',scale=1.75]
    % save length of g-vector and theta to macros
    \pgfmathsetmacro{\Gvec}{1.5}
    \pgfmathsetmacro{\myAngle}{30}
    % calculate lengths of vector components
    \pgfmathsetmacro{\Gcos}{\Gvec*cos(\myAngle)}
    \pgfmathsetmacro{\Gsin}{\Gvec*sin(\myAngle)}

    \coordinate (centro) at (0,0);
    \draw[dashed,gray,-] (centro) -- ++ (0,-3.5) node (mary) [black,below]{$ $};
    \draw[thick] (centro) -- ++(270+\myAngle:3) coordinate (bob);
    \pic [draw, ->, "$\theta$", angle eccentricity=2.3] {angle = mary--centro--bob};
    \draw [blue, -stealth] (bob) -- ($(bob)!\Gcos cm!(centro)$);
    \draw [-stealth] (bob) -- ($(bob)!-\Gcos cm!(centro)$)
      coordinate (gcos)
      node[midway,above right] {$mg\cos\theta$};
    \draw [-stealth] (bob) -- ($(bob)!\Gsin cm!90:(centro)$)
      coordinate (gsin)
      node[midway,above left] {$mg\sin\theta$};
    \draw [-stealth] (bob) -- ++(0,-\Gvec)
      coordinate (g)
      node[near end,left] {$mg$};
    \pic [draw, ->, "$\theta$", angle eccentricity=1.5] {angle = g--bob--gcos};
\end{tikzpicture}