Dr. Scheme: What I learned is that Dr. Scheme is hard to understand. You have to pay attention to known how to work with the program. If you don't understand the program right away you play around until Ms. Ossorio tells you it's time to turn it in. You really start understanding at the last minute and your work gets a 100.

(start 640 480)

( draw-solid-disk(make-posn 280 200)170'black)

(draw-solid-disk(make-posn 250 115) 15'black)

(draw-solid-disk(make-posn 250 115) 5'red)

(draw-solid-disk(make-posn 250 115) 2'black)

(draw-solid-disk(make-posn 320 115) 15'black)

(draw-solid-disk(make-posn 320 115) 5'red)

(draw-solid-disk(make-posn 320 115) 2'black)

(draw-solid-disk(make-posn 280 260)90'red)

(draw-solid-disk(make-posn 280 260)75'black)

(draw-solid-disk(make-posn 280 260)100'red)

(draw-solid-disk(make-posn 280 260)90'black)

(draw-solid-disk(make-posn 280 260)80'red)

(draw-solid-disk(make-posn 280 260)70'black)

(draw-solid-disk(make-posn 280 260) 60'red)

(draw-solid-disk(make-posn 280 260) 50'black)

(draw-solid-disk(make-posn 280 260) 40' red)

(draw-solid-disk(make-posn 280 260) 30' black)

(draw-solid-disk(make-posn 280 260) 20'red)

(draw-solid-disk(make-posn 280 260) 10' black)

(draw-solid-disk(make-posn 280 260) 5'red)

(draw-solid-disk(make-posn 280 260) 2' black)