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shapedraw by mju 

Turtle.draw do
  background lightslategray
  pencolor honeydew 
  num = ask "How many sides would you like the shape to have?"
  number= num.to_i
  if number%4==0
    number.times do
    forward 50
    turnright (180-((180*(number-2))/number))
      end
  else
    turnleft  (((180*(number-2))/number)-90)
    number.times do
    forward 50
    turnright (180-((180*(number-2))/number))
      end
   end 
 end