借用 Lisp 表达式亦可 $ A0 z5 r; u; ]. ?# Q % x& z& V6 @( ZCommand: Arc& b) l+ ?8 s4 b1 e& N2 V: `% r
Specify start point of arc or [Center]: 20,0$ _" g8 T& u; z5 }5 y
# [0 B+ I8 E' R5 x
Specify second point of arc or [Center/End]: C& A7 D/ q$ ^- K( d$ j6 i' v
Specify center point of arc: 0,0) y% S% X/ F4 ^& m9 S8 f& H
& t' g& ?8 Y9 Z$ jSpecify end point of arc or [Angle/chord Length]: A; e2 @/ q }& p3 ]/ _
Specify included angle: (/ 26.6 (/ Pi 180) 20) ; <=== (Lisp 表达式)