Python math.sqrt() function | Find Square Root in Python - Coding

sqrt() function returns square root of any number. It is an inbuilt function in Python programming language.

In this article, we will learn more about the Python Program to Find the Square Root.

sqrt() Function

We can calculate square root in Python using the sqrt() function from the math module. In this example, we are calculating the square root of different numbers by using sqrt() function.

Python3

# Python3 program to demonstrate the 
# sqrt() method 
 
# import the math module 
import math 
 
# print the square root of  0 
print(math.sqrt(0)) 
 
# print the square root of 4
print(math.sqrt(4)) 
 
# print the square root of 3.5
print(math.sqrt(3.5)) 

Output

0.0
2.0
1.8708286933869707

Definition of math.sqrt() Function

sqrt() function in Python is an in-built function, and it is present in the math library.

You can use the sqrt function after importing the math library.

import math

sqrt() function only takes a value greater than or equal to 0.

math.sqrt() Method Syntax

math.sqrt(x)

Parameter

x: is any number such that x>=0

Returns: It returns the square root of the number passed in the parameter.

sqrt() Function Examples

Let’s look at some different uses of math.sqrt() function.

Example 1: Check if Prime or Not

In this example, we are given a number and we are checking if a number is prime or not. Here,run a loop from 2 to sqrt(n) and check if any number in range (2-sqrt(n)) divides n.

Python3

# Python program for practical application of sqrt() function 
# import math module 
import math 
 
# function to check if prime or not 
def check(n): 
    if n == 1: 
        return False
         
        # from 1 to sqrt(n) 
    for x in range(2, (int)(math.sqrt(n))+1): 
        if n % x == 0: 
            return False
    return True
 
# driver code 
n = 23
if check(n): 
    print("prime") 
else: 
    print("not prime")

Output

prime

Example 2: Finding Hypotenuse Of a Triangle

In this example, we are using sqrt() function to find the hypotenuse of a triangle.

Python3

a = 10
b = 23
 
import math
 
# importing the math module
c = math.sqrt(a ** 2 + b ** 2)
 
print( "The value for the hypotenuse would be ", c)

Output

The value for the hypotenuse would be  25.079872407968907

sqrt() Function Error

When x<0 it does not execute due to a runtime error. In this example, we can see that we cannot calculate the Python square root if the number is less than zero.

Python3

# Python3 program to demonstrate the error in
# sqrt() method
 
# import the math module
import math
 
# print the error when x<0
print(math.sqrt(-1))

Output

Traceback (most recent call last):
  File "/home/67438f8df14f0e41df1b55c6c21499ef.py", line 8, in 
    print(math.sqrt(-1)) 
ValueError: math domain error

This was all about the sqrt() function that is used to find square root in Python. Finding square root in Python is very easy with this in-built function.

For more Math Library Functions : Python Math Module

Reffered: https://www.geeksforgeeks.org

Python

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