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