如何确定 D 点的坐标,延长之后恰好交于点D?
- \begin{center}
- \begin{tikzpicture}[scale=1.8]
- \coordinate (o) at(0,0) node[left] at (o) {$O$};
- \coordinate (a) at(40:1) node[above right] at (a) {$A$};
- \coordinate (b) at(-60:1) node[below right] at (b) {$B$};
- \coordinate (c) at(-120:1) node[below left] at (c) {$C$};
- \draw[thick](o) circle (1);
- \draw[-Stealth](o)--(c);
- \draw[-Stealth](o)--(b);
- \draw[-Stealth](o)--(a);
- \draw(a)--(b);
- \end{tikzpicture}
- \end{center}
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