Drawing with the Logo Turtle

Brain Teaser:

Do we really need the BACK command? Can we make the Turtle move backward using only the FORWARD and RIGHT commands?

Answer:

We actually can move the Turtle backward without using the BACK command. The following instructions do the same job as BK 100.

RT 180 FD 100 RT 180

Number 1

CS

RT 30 FD 50

RT 150 FD 200

RT 90 FD 50 BK 100

FD 50 RT 90

Stick at an angle

CS

RT 30

FD 250 RT 90 FD 20 RT 90

FD 250 RT 90 FD 20 RT 90

LT 30

Cross X

CS

RT 30

FD 100 BK 200 FD 100

LT 60

FD 100 BK 200 FD 100

RT 30

Logo Challenge: Hexagon with gaps

CS

PU FD 8 PD FD 100 PU FD 8 PD RT 60

PU FD 8 PD FD 100 PU FD 8 PD RT 60

PU FD 8 PD FD 100 PU FD 8 PD RT 60

PU FD 8 PD FD 100 PU FD 8 PD RT 60

PU FD 8 PD FD 100 PU FD 8 PD RT 60

PU FD 8 PD FD 100 PU FD 8 PD RT 60

Shapes in the Collage:

CS FD 200 BK 100 RT 90 FD 100 LT 90 FD 100 BK 200

CS

FD 100 RT 90

FD 100 RT 90

FD 100 RT 90

FD 100 RT 90

CS

FD 100 RT 90 FD 200 RT 90

FD 100 RT 90 FD 200 RT 90

CS

FD 50 RT 90 FD 50 LT 90

FD 50 RT 90 FD 50 LT 90

FD 50 RT 90 FD 50 LT 90

CS

FD 100 RT 90 FD 10 RT 90

FD 100 RT 90 FD 10 RT 90

PU FD 110 PD

FD 10 RT 90 FD 10 RT 90

FD 10 RT 90 FD 10 RT 90

PU BK 110 PD

CS

RT 45 BK 50 FD 100 BK 50 LT 90 BK 50 FD 100 BK 50 RT 45

CS

RT 90 FD 100 BK 100 LT 90 PU BK 20 PD

RT 90 FD 100 BK 100 LT 90 PU BK 20 PD

RT 90 FD 100 BK 100 LT 90 PU BK 20 PD

CS

FD 100 LT 90 FD 25 RT 120

FD 50 RT 120

FD 50 RT 120

FD 50 RT 120

CS
FD 100 LT 150 FD 100 RT 120

FD 100 LT 150 FD 100

PU LT 90 FD 100 LT 90 PD