Regular Polygons

from turtle import Turtle

tina = Turtle()

def draw_regular_polygon(turtle_name, num_sides, length_side,col):
    turtle_name.color(col)
    rotation = 360/num_sides
    for index in range(num_sides):
        turtle_name.forward(length_side)
        turtle_name.left(rotation)

for n in range(3, 18):
    draw_regular_polygon(tina, n, 25,"red")