Draw Circle in Python using Turtle

Turtle is a Python feature like a drawing board, which lets us command a turtle to draw all over it! We can use functions like turtle.forward(…) and turtle.right(…) which can move the turtle around. Turtle is a beginner-friendly way to learn Python by running some basic commands and viewing the turtle do it graphically. It is like a drawing board that allows you to draw over it. The turtle module can be used in both object-oriented and procedure-oriented ways.
To draw, Python turtle provides many functions and methods i.e. forward, backward, etc. Some the commonly used methods are:

• forward(x): moves the pen in the forward direction by x unit.
• backward(x): moves the pen in the backward direction by x unit.
• right(x): rotate the pen in the clockwise direction by an angle x.
• left(x): rotate the pen in the anticlockwise direction by an angle x.
• penup(): stop drawing of the turtle pen.
• pendown(): start drawing of the turtle pen.

Now to draw a circle using turtle, we will use a predefined function in “turtle”.
circle(radius): This function draws a circle of the given radius by taking the “turtle” position as the center.
Example:

Python3

# Python program to demonstrate
# circle drawing


import turtle

# Initializing the turtle
t = turtle.Turtle()


r = 50
t.circle(r)

Output :

Tangent Circles

A tangent is a line that touches the circumference of a circle from outside at a point, provided that any extension of the line will not cause intersection with the circle. Now, think about a group of circles, that have a common tangent. The group of circles, having common tangent, are known as tangent circles.
Example:

Python3

# Python program to demonstrate
# tangent circle drawing


import turtle

t = turtle.Turtle()

# radius for smallest circle
r = 10

# number of circles
n = 10

# loop for printing tangent circles
for i in range(1, n + 1, 1):
    t.circle(r * i)

Output :

Spiral Circle

Spiral is a shape similar to a circle, except that the radius of the spiral gradually increases after every completed round.
Example:

Python3

# Python program to demonstrate
# spiral circle drawing


import turtle

t = turtle.Turtle()

# taking radius of initial radius
r = 10

# Loop for printing spiral circle
for i in range(100):
    t.circle(r + i, 45)

Output :

Cocentric Circles

The term concentric is used for a group of things having common. Now Circles having the same center are termed as Concentric Circle.

Python3

# Python program to demonstrate
# concentric circle drawing


import turtle


t = turtle.Turtle()

# radius of the circle
r = 10

# Loop for printing concentric circles
for i in range(50):
    t.circle(r * i)
    t.up()
    t.sety((r * i)*(-1))
    t.down()

Output :