c1 = circle(x=50, y=0, r=50) c2 = circle(x=-50, y=0, r=50) c3 = circle(x=0, y=50, r=50) c4 = circle(x=0, y=-50, r=50) show(c1,c2,c3,c4) x1,y1= -100,0 x2,y2= 0,100 x3,y3= 100,0 x4,y4= 0,-100 z1= line(x1,y1,x2,y2) z2= line(x2,y2,x3,y3) z3= line(x3,y3,x4,y4) z4= line(x4,y4,x1,y1) show(z1,z2,z3,z4) c5 = circle(r=100) show(c5) z5= rectangle(w=200,h=200) show(z5)