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How to draw a triangle in Python

How to draw a triangle in Python

Le’ts learn how to draw a triangle in Python. We can easily do that using the turtle module.

These are the methods that we will use to create a triangle.

  • Turtle(): It will instantiate a new turtle object.
  • forward(): It takes a number and moves the turtle (pen) by that given distance.
  • left(): It turns the turtle to a given angle in the anti-clockwise direction. By default, it takes an angle in degrees.
  • right(): It turns the pen in the clockwise direction.
  • fillcolor(): This method sets the color of the shape to be drawn.
  • begin_fill(): We need to call this method before drawing the shape that needs to be filled.
  • end_fill(): We need to call this method after we have drawn the shape. It fills it with the given color.

Now that we know all the required methods, let’s get started and draw a basic triangle.

 

import turtle

turt = turtle.Turtle() 
#instantiate a new object

turt.fillcolor("cyan") #set the color of the triangle to cyan

turt.begin_fill()



turt.left(120)

turt.forward(150)

turt.left(120)

turt.forward(150)

turt.left(120)

turt.forward(150)



turt.end_fill()

turtle.done()#pauses the program

 

Initially, we create a new turtle object. Then, we set the color of the shape to cyan and call the begin_fill() method. After that, we start drawing the triangle.

First, we rotate the pen 120o anti-clockwise, and then we move it forward 150 pixels in that direction. This is what we get.

 

Draw a triangle in Python

Draw a triangle in Python Step 1

 

Then, we need to go down. For that, we again rotate 120o anti-clockwise and then 150 pixels forward.

Draw a triangle in Python Step 2

Draw a triangle in Python Step 2

 

The last step is to draw a horizontal line to complete the triangle. We need to repeat the same step. The final triangle is given below.

Draw a triangle in Python Step 3

Draw a triangle in Python Step 3

 

Instead of repeating the same lines of code, we can use a loop. Let’s see.

 

import turtle



turt = turtle.Turtle() #instantiate a new object



turt.fillcolor("cyan") #set the color of the triangle to cyan
turt.begin_fill()



for i in range(0, 3):

    turt.left(120)

    turt.forward(150)


turt.end_fill()

turtle.done()

 

The above triangle is equilateral. Let’s now draw a right-angled triangle.

 

import turtle



turt = turtle.Turtle() #instantiate a new object



turt.fillcolor("cyan") #set the color of the triangle to cyan

turt.begin_fill()





turt.left(90)

turt.forward(150)

turt.left(225)

turt.forward(212.13)

turt.left(225)

turt.forward(150)



turt.end_fill()

turtle.done()

 

Output

Triangle in Python

Triangle in Python

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