（一）
(defun c:tuxing1 ()
(setq Rd (getdist "\n R=:"))
(setq Rx (getdist "\n r=:"))
(setq p0 (getPoint "\n Enter Center of Circle"))
(setq p1 (list(car p0) (+ (+ (cadr p0) Rd) 5)))
(setq p2 (list(- (- (car p0) Rd) 5) (cadr p0)))
(setq p3 (list(car p0) (- (- (cadr p0) Rd) 5)))
(setq p4 (list(+ (+ (car p0) Rd) 5) (cadr p0)))
(Command "line" p1 p3"")
(Command "line" p2 p4"")
(Command "circle" p0 Rd)
(Command "circle" p0 RX)
)
（二）
(defun c:tuxing2 ()
(setq Rd (getdist "\n R=:"))
(setq Rx (getdist "\n r=:"))
(setq p0 (getPoint "\n Enter Center of Circle"))
(setq a1 (list(+ (car p0) (* (cos (/ pi 4)) Rx)) (+ (cadr p0) (* (cos (/ pi 4)) Rx))))
(setq a2 (list(- (car p0) (* (cos (/ pi 4)) Rx)) (cadr a1)))
(setq a3 (list(car a2) (- (cadr p0) (* (cos (/ pi 4)) Rx))))
(setq a4 (list(car a1) (cadr a3)))
(setq b1 (list(+ (car p0) (* (cos (/ pi 4)) Rd)) (+ (cadr p0) (* (cos (/ pi 4)) Rd))))
(setq b2 (list(- (car p0) (* (cos (/ pi 4)) Rd)) (cadr b1)))
(setq b3 (list(car b2) (- (cadr p0) (* (cos (/ pi 4)) Rd))))
(setq b4 (list(car b1) (cadr b3)))
(Command "line" a1 a2 a3 a4 a1"")
(Command "line" b1 b2 b3 b4 b1"")
(Command "circle" p0 Rd)
(Command "circle" p0 RX)
)
（三）
(defun c:tuxing3 ()
(setq r (getdist "\n r=:"))
(setq p0 (getPoint "\n Enter Center of Circle"))
(setq p1 (list(- (car p0) (* r 2)) (cadr p0)))
setq p2 (list(+ (car p0) (* r 2)) (cadr p0)))
((Command "circle" p0 r)
(Command "circle" p1 r)
(Command "circle" p2 r)
)
（四）
(defun c:tuxing4 ()
(setq r (getdist "\n r=:"))
(setq p0 (getPoint "\n Enter Center of Circle"))
(setq a1 (list(+ (car p0) (* (cos (/ pi 4)) r)) (+ (cadr p0) (* (cos (/ pi 4)) r))))
(setq a2 (list(- (car p0) (* (cos (/ pi 4)) r)) (cadr a1)))
(setq a3 (list(car a2) (- (cadr p0) (* (cos (/ pi 4)) r))))
(setq a4 (list(car a1) (cadr a3)))
(Command "line" a1 a2 a3 a4 a1"")
(Command "circle" p0 r)
）
可以了,你试试吧!