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:**

`# 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:**

`# 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.

**Exmaple:**

`# 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.

`# 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 :**

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