#lang racket
(require (lib "turtles.ss" "graphics"))
(define carre (lambda (lgr) (begin (turtles #t) (draw lgr) (turn 90) (draw lgr) (turn 90 ) (draw lgr) (turn 90) (draw lgr))))
(define hexagone ( lambda (lgr) (begin (turtles #t ) ( draw lgr )(turn 60) ( draw lgr )(turn 60)( draw lgr )(turn 60)( draw lgr )(turn 60)( draw lgr )(turn 60)( draw lgr )(turn 60))))
(define figure ( lambda (n lgt) (let (( angle (/ 360 n))) (letrec ((f (lambda(i) (if (not (= i 0)) (begin (draw lgt) (turn angle) (f (- i 1))) (turn ( / 360 (/ n 2)) ))))) (f n)
                                                          ))))