TikZでかいた図形

\begin{tikzpicture}
%長さを描くためのマクロ
\def\preleng#1#2#3#4#5{
\draw (#1).. controls ($(#1)!.2!(#2)!{#4}!{#5}:(#2)$)
and ($(#1)!.8!(#2)!{#4}!{#5}:(#2)$) .. (#2)
node[midway, fill=white, inner sep = 0.3pt] (#1-#2) {#3}
}

%頂点
\tikzmath{
    \O{1} = 0;
    \O{2} = 0;
    \A{1} = 0;
    \A{2} = 4.5;
    \B{1} = 0;
    \B{2} = 0;
    \C{1} = 6;
    \C{2} = 0;
    \Radii{1} = 0.5*\C{1};
    \Radii{2} = 0.5*\A{2};
}
\coordinate (O) at (\O{1},\O{2});
\coordinate (A) at (\A{1},\A{2});
\coordinate (B) at (O);
\coordinate (C) at (\C{1},\C{2});


%三角形をかく
    \draw[very thick](A) -- (B) --(C) --cycle;

%頂点の名前
\node[above left] at (A) {A}
    node[below left] at (B) {B}
    node[below right] at (C) {C};


%半円を描く
%左側
    \draw[name path = C,very thick,samples=100,domain=-90:90] plot ({\Radii{2}*cos(\x)+0.5*\A{1}},{\Radii{2}*sin(\x)+0.5*\A{2}});
%右側
    \draw[name path = L,very thick,samples=100,domain=0:180] plot ({\Radii{1}*cos(\x)+0.5*\C{1}},{\Radii{1}*sin(\x)+0.5*\C{2}});


%交点を作成
\path[name intersections={of=L and C}] (intersection-1) coordinate (D);
    \node[above right] at (D) {D};




%斜線
\begin{scope}
\tikzmath{
    \hwidth = 0.2;
    \lineRange = 20;
    \dirVecx = 2;
    \dirVecy = 1;
}
\coordinate (dirVec) at (\dirVecx,\dirVecy);

\clip
[samples=100,domain=18:90] plot ({\Radii{2}*cos(\x)+0.5*\A{1}},{\Radii{2}*sin(\x)+0.5*\A{2}}) -- (D)
[samples=100,domain=0:107] plot ({\Radii{1}*cos(\x)+0.5*\C{1}},{\Radii{1}*sin(\x)+0.5*\C{2}}) -- (C)
[samples=100,domain=107:180] plot ({\Radii{1}*cos(\x)+0.5*\C{1}},{\Radii{1}*sin(\x)+0.5*\C{2}})
[samples=100,domain=-90:18] plot ({\Radii{2}*cos(\x)+0.5*\A{1}},{\Radii{2}*sin(\x)+0.5*\A{2}})
;
\foreach \x in {-100,...,100}
    {
    \draw ($(\x*\hwidth,0)+\lineRange*(dirVec)$) -- ($(\x*\hwidth,0)-\lineRange*(dirVec)$);
    }
\end{scope}

%長さを書く
\def\wrleng(#1-#2)#3{
\preleng{#1}{#2}{#3}{25pt}{-90}
}%
\wrleng (A-B){6 \unicm };

\def\wrleng(#1-#2)#3{
\preleng{#1}{#2}{#3}{25pt}{-90}
}%
\wrleng (A-C){10 \unicm };

\def\wrleng(#1-#2)#3{
\preleng{#1}{#2}{#3}{20pt}{-90}
}%
\wrleng (B-C){8 \unicm };

\def\wrleng(#1-#2)#3{
\preleng{#1}{#2}{#3}{25pt}{-90}
}%
\wrleng (A-C){10 \unicm };
\end{tikzpicture}
\end{preview}