【010_トイレットペーパー】コマ大数学科

#【010_トイレットペーパー】コマ大数学科

\begin{tikzpicture}[>=stealth]
% 右側の楕円をかく
  \filldraw [fill=black!20!white](4,0) ellipse [x radius=0.1,y radius=0.4];
  \draw (4,0) ellipse [x radius=0.5,y radius=2];
% 右側の芯の楕円を描く
  \draw [dashed] (0,0) ellipse [x radius=0.1,y radius=0.4];
% トイレットペーパーを描く
  \draw (0,2)--(4,2);
  \draw (0,-2)--(4,-2);
  \draw [dotted](0,0.4)--(4,0.4);
  \draw [dotted](0,-0.4)--(4,-0.4);
% 点線部分を描く
  \draw [dashed] (0,-2) arc [start angle=-90,end angle=90, x radius=0.5,y radius=2];
  \draw (0,2) arc [start angle=90,end angle=270, x radius=0.5,y radius=2];

  \draw (4,2)--(7,2);
  \draw (4,-2)--(7,-2);
  \draw [->](6.5,0)--(6.5,2);
  \draw [->](6.5,0)--(6.5,-2);
  \node at (7,0){$11$cm};

  \draw (4,0.4)--(6,0.4);
  \draw (4,-0.4)--(6,-0.4);
  \draw [->](5,0)--(5,0.4);
  \draw [->](5,-0)--(5,-0.4);
  \node at (5.5,0){$4$cm};
\end{tikzpicture}