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How to generate a right-angled triangle using numbers in Python

Vinisha Maheshwari

In this shot, we will discuss how to generate a right-angled triangle using numbers in Python.

We can print a plethora of patterns using Python. The basic and only prerequisite is a good understanding of how loops work in Python. Here, we will be using simple for loops to generate a right-angled triangle using stars and numbers.

Description

A triangle is said to be right-angled if and only if it has one angle equal to 90 degrees.

To execute this using Python programming, we will be using two for loops:

  • An outer loop to handle the number of rows.
  • An inner loop to handle the number of columns.

Code

Let’s look at the code snippet below to understand it better.

# Number of rows
rows = 5

# Outer loop to handle the rows
for i in range(rows):
    
    # Inner loop to handle the columns
    for j in range(i + 1):
        
        # Printing the pattern
        print(j+1, end=' ')
    
    # Next Line
    print()

Explanation

  • In line 2, the input for the number of rows (i.e., length of the triangle) is taken.

  • In line 5, we create a for loop to handle the number of rows.

  • In line 8, we create a nested for loop (inner loop), to handle the number of columns.

  • In line 11, we print the pattern, and we have printed j+1, which results in iteration from 1 (since j + 1) to length of i in each row. i keeps increasing with increasing rows, and so the numbers keep increasing as the line number increases.

  • In line 14, we use print() to move to the next line.

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