Triangular Spiro graph

 

import turtle as t

def spiral_shape(p, c):
    if p > 0:
        t.forward(p)
        t.right(c)
        spiral_shape(p-5, c)
        
       
t.shape('classic')
t.reset()
t.pen(speed = 0)
length = 400
turn_by = 9912
t.penup()
t.pendown()
spiral_shape(length, turn_by)
t.shape('turtle')
t.hideturtle()