It looks to me that something like below would result in nicer, equiangularly rotated squares.

for step in range(24):
    right(105)
    ...

I have used this code and added question here it is

from turtle import *
from time import *
inc=raw_input("What ingrament would you like? [1-360]")
inc=int(inc)
ang=raw_input("What angle would you like? [1-360]")
ang=int(ang)
col_squ=raw_input("What colour would you like the square to be?")
col_cir=raw_input("What colour would you like the circle to be?")
    # pen/turtle starts at the center (x=0, y=0) of the turtle display area
color(col_cir)
    # pen up, don't draw
up()
    # centers the circle
goto(0,-50)
    # pen down, draw
down()
    # radius=50 center is 50 radius units above the turtle
circle(50)
up()
    # center the turtle again
goto(0,0)
down()
    # draw blue 100x100 squares
color(col_squ)
for deg in range(0, 360, inc):
    down()
    right(90 + ang)
    forward(100)
    right(90)
    forward(100)
    right(90)
    forward(100)
    right(90)
    forward(100)
    up()
goto(-150,-120)
color("red")
write("Done!")
sleep(5) # wait 5 seconds

Another look at the Python module turtle:

# module turtle is part of Tkinter
# turtle starts in the center of canvas (0, 0) by default
# draw 3 turtle lines to form a triangle

import turtle as tu

tu.title('draw an equilateral triangle')
# set at 50% of original size
tu.setup(width=0.5, height=0.5)

# optional ...
# values for speed are 'fastest' (no delay), 'fast', (delay 5ms),
# 'normal' (delay 10ms), 'slow' (delay 15ms), 'slowest' (delay 20ms)
#tu.speed('fastest')

# optional ...
# turtle by default starts at (x=0, y=0) center of a (450x550) window
# to pick another center lift the pen up then move
# to the right x units and up y units or ...
# to the left -x units and down -y units
# now drop the pen down to start drawing
tu.up()
tu.goto(60, 100)
tu.down()

# optional pen color
tu.color('red')

# form a triangle by drawing 3 lines of 150 pixels length
# changing the direction by 120 degrees (360/3) each time
# starts at upper right corner and points down
for k in range(3):
    tu.right(120)
    tu.forward(150)

# keep showing until window corner x is clicked
tu.done()

Just to see what it would take, modifying Ene's code to draw a right angle triangle of unknown dimensions is just a little more tedious

import turtle as tu
import random

tu.title('draw a right angle triangle')
# set at 50% of original size
tu.setup(width=0.5, height=0.5)

tu.up()
tu.goto(60, 100)
tu.down()

# optional pen color
tu.color('red')

hypotenuse=random.randint(100, 200)
base=random.randint(10, 99)
side = (hypotenuse**2 - base**2)**0.5
## round up the "old" way
side += 0.5
side = int(side)

for distance in (base, side):
    tu.forward(distance)
    tu.right(90)

## since we are using whole numbers, the sides will not be exact,
## so go to the starting point
tu.goto(60, 100)

# keep showing until window corner x is clicked
tu.done()