How to Draw a Triangle in Python — Quick Guide

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 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 drawing the shape. It fills it with the given color.

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

To draw a triangle in Python, use this code:

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 shape’s color to cyan and call the begin_fill() method. After that, we start drawing the triangle.

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

 

 

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

 

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.

 

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.

To draw a right-angled triangle, use this code:

 

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