【45＿軌跡】コマ大数学科

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    \draw (0,0) rectangle (6,6);
    % 塗りつぶし
    \fill [cyan!50!white](0,6)--(3,{6-3*sqrt(3)})--(6,6)--(3,{3*sqrt(3)})--cycle;
    \draw [cyan!50!white,line join=rounded](0,6)--(3,{6-3*sqrt(3)})--(6,6)--(3,{3*sqrt(3)})--cycle;
    \filldraw [fill=cyan!50!white,thick,name path=A,line join=rounded](0,6) arc (90:60:6) (6,6) arc (90:120:6)(0,6) arc (180:240:6)(6,6) arc (0:-60:6);

  \end{tikzpicture}



\begin{tikzpicture}[xscale=0.5,yscale=0.5]
  % \draw (0,0) rectangle (6,6);
  % 塗りつぶし
  \fill [cyan!50!white](0,6)--(3,{6-3*sqrt(3)})--(6,6)--(3,{3*sqrt(3)})--cycle;
  \draw [cyan!50!white,line join=rounded](0,6)--(3,{6-3*sqrt(3)})--(6,6)--(3,{3*sqrt(3)})--cycle;
  \filldraw [fill=cyan!50!white,thick,name path=A,line join=rounded](0,6) arc (90:60:6) (6,6) arc (90:120:6)(0,6) arc (180:240:6)(6,6) arc (0:-60:6);
  \draw (-1,{6-3*sqrt(3)})--++(35,0);
  \fill [white!20!black](-1,0) rectangle (35,{6-3*sqrt(3)});
  \fill [white!40!black](-1,-1) rectangle (35,0);
  \fill [white!60!black](-1,-2) rectangle (35,-1);
  \fill [white!80!black](-1,-3) rectangle (35,-2);
\end{tikzpicture}