摘要： \begin{tikzpicture}[scale=1,>=latex]\draw (0,0) circle (1cm);\fill (0,0) circle (1pt);\coordinate (p1) at (135:1cm);\coordinate (p2) at (-45:1cm);\coordinate (p3) at (p1 |-p2);\draw (p1) to (p2);\draw (p1) to (p3) to (p2);\node (p) at (-1.1,0){\scriptsize 1};\coordinate (tmp1) at (-1.1,0.7);\coor 阅读全文