turtle ARC length angle CIRCLE radius CLEARTEXT HIDETURTLE PENWIDTH width PRINT [ . ] RESET SETHEADING angle SETX x SETXY x y SETY y SHOWTURTLE maths ARCTAN number COS angle INT number RANDOM number ROUND number SIN angle SQRT number lists BUTFIRST list BUTLAST list FIRST list FPUT thing list ITEM index thing LAST list LPUT thing list SETITEM index array value